Big Setbacks Propel Oil Giants Toward a ‘Tipping Point’

A surprising mix of environmentalists, pension fund managers and big money investors have scored startling victories against oil and coal, opening new battle fronts in the climate fight.

By Somini Sengupta, The New York Times, May 29, 2021

A nun, an environmental lawyer, pension fund executives, and the world’s largest asset manager. These were among the unusual collection of rebels who claimed a series of startling victories this week against some of the world’s biggest and most influential fossil fuel companies.

From Houston to The Hague, they fought their battles in shareholder meetings and courtrooms, opening surprising fronts in an accelerating effort to force the world’s coal, oil and gas companies to address their central role in the climate crisis. And even as they came with strikingly disparate points of view — corporate shareholders, children’s rights advocates, environmentalists, thousands of Dutch citizens — they delivered a common underlying message: The time to start retreating from the fossil fuel business is no longer in the future, but now.

“These companies are facing pressure from regulators, investors, and now the courts to up their game,” said Will Nichols, head of environmental research at Maplecroft, a risk analysis firm. “That’s a big chunk of society, and it’s not a great look to be pushing back against all of that.”

The most dramatic turning point came in the Netherlands, where a court instructed Royal Dutch Shell, the largest private oil trader in the world and by far the largest company in the Netherlands itself, that it must sharply cut greenhouse gas emissions from all its global operations this decade. It was the first time a court ordered a private company to, in effect, change its business practice on climate grounds.

The symbolism was inescapable: The Netherlands, famously built on land reclaimed from the sea, faces the immediate threat from a warming climate caused by the burning of Shell’s own products — oil and gas.

In another example this week, at the annual shareholder meeting of Exxon Mobil, the biggest American oil company, the message was framed sharply in terms of profits: A tiny new hedge fund led an investor rebellion to diversify away from oil and gas — or risk hurting investors and the bottom line.

Chevron’s shareholders voted to tell the company to reduce not only its own emissions, but also, remarkably, the emissions produced by customers who burn its oil and gasoline. And in Australia, a judge warned the government that a proposed coal mine expansion, a project challenged by eight teenagers and an 86-year-old nun, would need to ensure that it wouldn’t harm the health of the country’s children.

The timing was significant. This week scientists also concluded that, in the next five years, the average global temperature will at least temporarily spike beyond a dangerous threshold, climbing more than 1.5 degrees Celsius, or 2.7 degrees Fahrenheit, warmer than in pre-industrial times. Avoiding that threshold is the main objective of the Paris Accord, the landmark global climate agreement among the nations of the world to fight climate change.

Of course, none of these actions represents an immediate threat to the fossil fuel industry. For a century and a half, the global economy has been fueled by oil and coal, and that won’t change immediately.

Nevertheless, rulings like the one in the Netherlands could be a harbinger for similar legal attacks against other fossil fuel companies and their investors, experts said. Kate Raworth, an economist at Oxford University, called Shell’s loss in court “a social tipping point for a fossil-fuel-free future.”

Shell said it found the ruling, by a district court in The Hague, “disappointing” and intended to appeal. That process could take years to reach the country’s supreme court, delaying action but also drawing continued public attention.

If the ruling of the lower court stands, though, analysts said, Shell would most certainly have to reorient its business to reduce oil in its portfolio and halt its growth in liquefied natural gas, in which Shell is an industry leader. That is a matter of concern for the investors who have their money in the oil and gas reserves of companies like Shell, said Patrick Parenteau, a professor at Vermont Law School. “A decision telling a company, ‘You’ve got to get out of the oil business.’ For cautious individuals within the financial community, that’s got to cause them serious concerns.”

Dangerously for Shell, the national judiciary of the Netherlands in the past has shown itself to be among the most out-front on climate litigation. In 2019, the Supreme Court of the Netherlands ordered the government to cut greenhouse gas emissions because of a lawsuit filed by Urgenda, an environmental group. It was the first case in the world to force a national government to address climate change in order to uphold its human rights commitments.

That case, too, began in a district court in The Hague, before making its way up the judicial ladder. The lawsuit against Shell marked an escalation in that strategy.

Having sued the government and won, environmental advocates decided to take on one the country’s most influential companies. The case was brought in 2019 by Milieudefensie, the Dutch branch of Friends of the Earth, as well as Greenpeace and 17,000 residents of the Netherlands. The complainants argued that the company has a legal duty to protect Dutch citizens from looming climate risks. The district court agreed.

“The consequences of this case for the fossil fuel industry will be systemic and immediate,” Tessa Khan, the lawyer who had sued the government on behalf of Urgenda, said on Twitter. She predicted that it would spur other cases and “escalate the perception of risk among investors.”

Shell had already begun to see the writing on the wall. It said earlier this year that global oil demand had likely reached a peak in 2019 and would slowly wane in the coming years.

And at least compared to some of its American peers, Shell had set relatively more ambitious climate targets. It had already promised to reduce the carbon intensity of its operations, which means that it could still continue to expand oil and production, but with lower emissions for every barrel it produced.

The district court on Wednesday instructed the company to cut its absolute emissions by 45 percent by 2030, relative to its 2019 levels. The ruling applies to Shell’s global operations. But, that said, even if it is upheld on appeal, enforcing it, say, in Nigeria, where Shell is the biggest oil producer, could prove to be “impractical,” said Biraj Borkhataria, an analyst at RBC Capital Markets, an investment bank.

“However,” he said separately, in a note to clients on Thursday, “it is another example of society asking more from oil companies.”

The Shell ruling is particularly notable because private companies have been targets of climate litigation in the United States and elsewhere, but courts have rarely ruled against them.

The Dutch case opens a potentially new front, emboldening climate advocates to pursue more cases in a wider variety of countries, particularly where national laws enshrine the right to a clean environment. Several European and Latin American courts, including in the Netherlands, have interpreted their national laws in this way.

A farmer in Peru is suing a German energy giant over the effects of global warming on a glacier in his country. About 20 American cities, counties and states have sued the fossil fuel industry since 2017, seeking damages for the local costs of climate change.

Governments are also on the hook.

Germany’s highest court recently told the government to tighten its climate targets because they did not go far enough to ensure that future generations would be protected.

In the Australian case, eight teenagers, joined by Brigid Arthur, the nun, went to court to stop the government from expanding an enormous coal mine called Whitehaven. The court on Thursday stopped short of issuing an injunction against the mine, as the plaintiffs had sought.

But in ordering the government to take “reasonable care to avoid personal injury to the children,” it recognized climate change as an “intergenerational crime,” said Michael Burger, executive director of the Sabin Center for Climate Change Law at Columbia University and a lawyer who represents several U.S. cities and states suing fossil fuel companies.

“The actions we take today with respect to climate change can consign our children, our children’s children, and other future generations to a world that is fundamentally livable or a world that is not,” he said. “Courts recognize that.”

The most closely watched case in the United States, filed on behalf of young people against the United States government, seeks to establish a constitutional right to a sound environment. After recent setbacks in the federal courts, a federal judge has ordered the parties to enter settlement discussions.

The actions against Chevron and Exxon are notable because they reveal the extent to which shareholders are quickly awakening to the risk that their investments if energy companies don’t dramatically start changing their business models.

A significant chunk of shareholders demonstrated that they were increasingly distrustful that the companies could deliver the financial performance they expected without diversifying away from oil and gas.

Exxon this week lost a battle against a small new hedge fund, Engine No. 1, which rallied big investors like Blackrock and the New York state pension fund to force the company to change course. The hedge fund won at least two seats on Exxon’s 12-member board.

Tensie Whelan, director of the New York University Stern Center for Sustainable Business, called it “a pivotal moment for board accountability.” Activist shareholders have traditionally taken on company executives over financial issues, not social issues like climate change, she said. “Shareholders are deeply concerned about the financial risks posed by climate change and increasingly willing to hold the board to account,” Ms. Whelan said.

Stanley Reed and John Schwartz contributed reporting.

https://www.nytimes.com/2021/05/29/climate/fossil-fuel-courts-exxon-shell-chevron.html?action=click&module=Spotlight&pgtype=Homepage

Severe Drought, Worsened by Climate Change, Ravages the American West

Heat and shifting weather patterns have intensified wildfires and sharply reduced water supplies across the Southwest, the Pacific Coast and North Dakota.

By Henry Fountain, The New York Times, May 20, 2021

ALBUQUERQUE — This year, New Mexican officials have a message for farmers who depend on irrigation water from the Rio Grande and other rivers: Unless you absolutely have to plant this year, don’t.

Years of warming temperatures, a failed rainy season last summer and low snowpack this winter have combined to reduce the state’s rivers to a relative trickle. The agency that controls irrigation flows on the Rio Grande forced the issue. To conserve water, it opened its gates a month later than usual.

Severe drought — largely connected to climate change — is ravaging not only New Mexico but the entire Western half of the United States, from the Pacific Coast, across the Great Basin and desert Southwest, and up through the Rockies to the Northern Plains.

In California, wells are drying up, forcing some homeowners to drill new ones that are deeper and costlier. Lake Mead, on the border of Arizona and Nevada, is so drained of Colorado River water that the two states are facing the eventual possibility of cuts in their supply. And 1,200 miles away in North Dakota, ranchers are hauling water for livestock and giving them supplemental forage, because the heat and dryness is stunting spring growth on the rangelands.

The most significant, and potentially deadly, effect of a drought that is as severe and widespread as any seen in the West is the wildfires that are raging amid hot and dry conditions. And this is well before the full blast of summer’s heat arrives.

California, Arizona and New Mexico have each had two large blazes, unusual for this early in the year. None has been fully contained, including the Palisades Fire, which has burned 1,200 acres on the outskirts of Los Angeles.

Officials are predicting when the fire season ends — if it ever does, as warming conditions have made fires possible year-round in some areas — the total could exceed last year’s of 10.3 million acres.

“The signals and indications are that we are heading for another very dangerous fire year,” Secretary of Agriculture Tom Vilsack, whose department includes the Forest Service, said last week after he and Interior Secretary Deb Haaland were briefed by experts from the National Interagency Fire Center. “We’re seeing a higher level of risk and an earlier level of risk than we’ve seen in the past.”

Many factors contribute to the frequency, intensity and duration of wildfires, including forest management practices and development. And water shortages are affected by population and economic growth, as well as pumping of groundwater for agriculture and other activities.

Legal constraints play a role, too. One reason for the squeeze on New Mexican farmers this year is that the state owes Rio Grande water to Texas under a 1938 agreement.

But at the root of the drought are warmer temperatures and changing precipitation patterns, which are linked to emissions of carbon dioxide and other greenhouse gases into the atmosphere, where they trap the sun’s heat. The result has been extremely dry conditions that have persisted across much of the Southwest and California for years, and that are spreading throughout the West.

According to the United States Drought Monitor, 84 percent of the West is now in drought, with 47 percent rated as “severe” or “extreme.”

The situation in some states is particularly dire. In Utah, 90 percent of the state is in the two most severe categories; in Arizona, 87 percent; North Dakota, 85 percent; New Mexico, 80 percent; and California, 73 percent.

Experts do not see much prospect for improvement, as another hot and dry summer is forecast. Rather, they expect conditions to worsen.

“We’re entering the climatologically dry period of the year,” said Adam T. Hartman, a meteorologist with the Climate Prediction Center, a part of the National Oceanic and Atmospheric Administration. “That’s a lot of the reason you see drought conditions start to deteriorate.”

The Southwest had its chances to improve starting last summer, a season when atmospheric circulation patterns typically bring tropical moisture to Arizona, New Mexico and parts of nearby states. But these so-called monsoon rains never materialized, and no one is sure exactly why. “It’s a bit of a mystery,” Mr. Hartman said.

This winter’s snowfall, or relative lack of it, didn’t help either. Snowpack totals across the West have been far below normal. In California on April 1, the date when the snow is normally deepest, statewide snowpack was just 59 percent of the historical average.

Relative to the often-soggy conditions in the East, much of the West is normally relatively dry. But with warming, precipitation has become less reliable, said Keith Musselman, a snow hydrologist at the University of Colorado. “These are regions that regularly go weeks without precipitation,” he said. “And now we’re talking in some cases about months.”

In the Southwest, especially, the drought has lingered for so long — since 2000, with only a few wet years sprinkled in — that climate scientists now talk of an emerging “megadrought,” one that may rival those that occurred periodically over the past thousand years. Those Southwestern megadroughts, which were discovered by analyzing ancient tree rings, lasted decades — in one case, 80 years.

California and other Western states rely on the melting of snow for much of their water. Snowpack is essentially a frozen reservoir that is released over time in spring and summer. But that, too, is changing as the West warms.

“There’s two things going on,” Dr. Musselman said. “First, there’s less precipitation. But on top of that there’s this backdrop of warming. That’s altering the delivery of that water.”

More meltwater runs off the mountains sooner, wreaking havoc with the ability to store proper amounts in reservoirs for use during the dry summer. Too much runoff too soon also eventually causes stream flows to drop rapidly.

And low stream flows can lead to a number of other problems, given that shallower water warms more rapidly. In California, for instance, some salmon hatcheries are trucking young fish directly to the ocean this spring, fearing that they wouldn’t survive swimming in the warmer water of rivers that have been affected by drought.

Heat and dryness have a particularly strong effect on the conditions that lead to wildfires, decreasing moisture in the soil and drying vegetation so that it ignites more readily and burns hotter. That can make fires spread more easily.

Severe drought can also result in mass die-offs of trees, providing enormous quantities of fuel for any potential fire. The Forest Service reported one such die-off in April in Arizona, where up to 30 percent of the juniper trees across about 100,000 acres had died from the drought.

Dry conditions can also make warming worse, said Amir AghaKouchak, who studies climate-related and other water resource issues at the University of California, Irvine. Warming causes soil to lose moisture through evaporation, which has a cooling effect on the surface of the ground, much as evaporation of sweat from skin causes a person to cool down. But eventually so much soil moisture is lost that the process stops.

“During droughts, moisture levels become very low, so evaporation doesn’t happen,” Dr. AghaKouchak said. “The skin of the earth warms up, and that warms the atmosphere.”

https://www.nytimes.com/2021/05/19/climate/drought.html

Bipartisan duo reintroduces carbon tax legislation

By Nick Sobczyk, E&E News, May 11, 2021

A bipartisan pair of lawmakers have reintroduced the carbon tax bill first drawn up by former Rep. Carlos Curbelo (R-Fla.).

Reps. Brian Fitzpatrick (R-Pa.) and Salud Carbajal (D-Calif.) last week announced the latest version of the "MARKET CHOICE Act."

The last version of the bill would have imposed a $35-per-ton tax on carbon emissions — rising 5% per year — with revenues funneled to infrastructure investment to replace the federal gasoline tax (E&E News PM, Sept. 26, 2019).

Neither Carbajal nor Fitzpatrick responded to a request for the text of the latest version of the legislation, H.R. 3039.

"Climate change demands our immediate attention and the Market Choice Act is a crucial way to move the ball forward while enhancing our crumbling infrastructure," Carbajal said in a statement.

When Curbelo introduced the legislation in 2018, it was seen as a milestone, the first GOP-backed carbon pricing bill in years.

Fitzpatrick could be a key moderate as Democrats and the White House forge ahead this year on infrastructure and climate legislation, but the bill may struggle to gain a foothold, with President Biden resistant to raising user fees to pay for roads, bridges and highways.

The bill is backed by a variety of advocacy groups, including the Environmental Defense Fund and the Nature Conservancy.

https://www.eenews.net/eedaily/2021/05/11/stories/1063732201?utm_campaign=edition&utm_medium=email&utm_source=eenews:eedaily

Biden should embrace a carbon tax

Op-ed by Henry M. Paulson and Erskine B. Bowles

The Washington Post, May 10, 2021

President Biden deserves credit for his actions to date on climate change. In rejoining the Paris agreement, directing new energy standards, pushing for bold congressional action, convening world leaders and announcing dramatic emissions reduction targets, he is showing that American climate leadership is back. But there is one major climate policy arena where the United States needs to take a bold step forward: carbon pricing.

carbon tax, which taxes carbon dioxide and other greenhouse-gas emissions, is a proven means to raise large sums of much-needed revenue while lowering carbon emissions. It is supported by 67 percent of Americans, embraced by a bipartisan consensus of economists and increasingly supported by the business community. Some critics argue a carbon tax is a political distraction, one that fails to meet the climate challenge and disproportionately hurts the poor. Others say a carbon tax would damage U.S. competitiveness and break Biden’s promise to not raise taxes on households earning less than $400,000 a year. We believe each of these concerns can be addressed.

We have no illusions that a carbon tax is an easy sell in Washington. But it may be the only realistic way that Biden can advance his broader agenda. The opportunity lies in forging a bipartisan coalition of fiscally responsible legislators who know that we need to invest in infrastructure and that a carbon tax will be more successful in curbing emissions than excessive regulation will.

While attempting to address many of our country’s immediate and long-term needs, the administration’s spending proposals, on top of our nation’s already-leveraged balance sheet, push the limits of fiscal policy beyond what has historically been considered prudent. The short-term impact may well be positive. But the longer-term challenge is daunting. This year, U.S. debt is expected to exceed the value of the entire U.S. economy for the first time since World War II, posing a serious threat to our long-term future. A 2017 study by the Treasury Department estimates a carbon tax that starts at $49 per ton of emissions, rising at 2 percent annually, could raise $2.2 trillion over a 10-year period.

Would a carbon tax be regressive? Not necessarily. For one thing, the wealthy use a lot more carbon-based energy than those with lower incomes. More importantly, carbon tax revenue could be invested in poorer communities that face disproportionate risks from climate change; targeted to support and retrain workers who are adversely affected by the transition to a clean-energy economy; used to increase the earned income tax credit or other wage subsidies; or redistributed through dividend checks or tax rebates on a monthly basis. Or they could be distributed directly into individual retirement accounts. Such strategies would be highly progressive.

Of course, a primary reason for a carbon tax is to discourage firms from spewing carbon into the atmosphere and encourage them to develop, invest in and scale clean, low-carbon technologies. The Climate Leadership Council estimates a $40 per ton carbon tax, increasing by 5 percent per year above the rate of inflation, would reduce U.S. emissions to 50 percent below 2005 levels by 2035. A carbon tax also offers an incentive to other nations to drive down emissions. That’s because a necessary feature of any sensible carbon tax plan is what’s known as a border adjustment, which would impose economic penalties on certain goods from countries that do not reduce their emissions. In effect, this would protect American competitiveness and alleviate one of the biggest problems in global climate governance — that some countries free-ride on the emission cuts of others. This would move us beyond the model of the Paris agreement, which is based on voluntary emission targets that, while necessary, are wholly inadequate for averting the worst outcomes of climate change.

Putting a price on carbon would advance America’s leadership role in the world. Today, 46 countries and 35 subnational or regional entities, including markets in California and New England, are on the road to instituting carbon pricing mechanisms. The upshot is a mishmash of voluntary and mandatory markets with incompatible standards that price carbon imperfectly and inadequately. It is essential that we standardize the trade in carbon at home and reach agreements internationally to ensure the adequate functioning of this new market. Make no mistake: Carbon credits and debits are on a path to becoming the currency of climate change. The dollar is the world’s reserve currency because investors have confidence in the United States and its economy. The White House should be setting the standards to price carbon, creating the climate-change reserve currency. We can partner with the Europeans, and we certainly shouldn’t cede this responsibility to the Chinese.

The carbon tax is not a cure-all, of course. A mixture of other policies, from regulation and subsidies to R&D investment and targeted incentives, will be necessary to meet the climate challenge. More revenue, including user fees — tolls, vehicle miles taxes, congestion pricing — as well as a responsible increase in corporate taxes and an increase in the highest income tax rate will be needed to meet our fiscal and infrastructure needs. But without a price on carbon, the combined effect of these policies will be insufficient. We believe that, by embracing a carbon tax, President Biden could help restore America’s infrastructure, fiscal strength and leadership at a time when all are sorely needed.

Henry M. Paulson Jr. is a former U.S. treasury secretary and chairman of the Paulson Institute. Erskine B. Bowles served as chief of staff to President Bill Clinton and co-chair of the National Commission on Fiscal Responsibility and Reform. They are co-chairs of the Aspen Economic Strategy Group.

https://www.washingtonpost.com/opinions/paulson-bowles-biden-carbon-tax/2021/05/10/2230cda4-af62-11eb-b476-c3b287e52a01_story.html

Melting glaciers drove '21% of sea level rise' over past two decades

By Ayesha Tandon, CarbonBrief, April 28, 2021

Glacier melt across the world has accelerated over the past two decades, a new study finds, with the resulting meltwater accounting for 21% of global sea level rise over the same period.

The paper, published in Nature, is the first to analyse the rate of melting from almost every glacier on the planet – around 200,000 in total, excluding the Greenland and Antarctic ice sheets – to show how they have lost mass and thickness between 2000 and 2019.

Glaciers are currently losing more mass than either the Greenland or Antarctic ice sheets, the study finds, and annual rates of glacier thinning have “nearly doubled”  from 36cm in 2000 to 69cm in 2019.

The authors highlight that the accelerating rise in sea levels seen over the 21st century – which is “often attributed to the accelerated loss from both the Greenland ice sheet and Antarctic ice sheet” – is also “substantially” driven by melting glaciers.

The data behind this study really are “a game changer”, says one scientist who was not involved in the study. They tell Carbon Brief that the findings are further “rigorous evidence” of the “urgent need for rapid and collective action” to reduce greenhouse gas emissions.

‘A milestone in global glacier monitoring’

Glaciers are slow-moving rivers of ice that form from an accumulation of snow over many years. Around 10% of the world’s land surface is currently covered by glaciers, which store around 70% of the Earth’s freshwater.

However, as global temperatures rise, glaciers around the world – with just a few exceptions – are retreating at an unprecedented rate. Meltwater from glaciers is expected to be the second biggest contributor to global sea level rise during the 21st century.

Although there are more than 200,000 glaciers on the planet, only a few hundred are currently monitored in-situ. This means that scientists need to use other methods to keep track of the world’s retreating glaciers.

Prof Michael Zemp – a glaciologist at the University of Zurich and the director of the World Glacier Monitoring Service, who was not involved in the study – led the last global assessment on glacier mass change in 2019.

He tells Carbon Brief that, in his assessment, his team collected data for around 20% of the planet. By contrast, the new study was able to use imagery from NASA’s Terra satellite to achieve coverage of 97%. This is “a big step forward”, Zemp tells Carbon Brief.

The map below marks the location of the glaciers analysed in this study in purple. In the field of glaciology, 19 “glacierised” regions are often used to help scientists to compare glaciers from different parts of the world. These regions are shown by the boxes and numbers.

On top of the improved spatial coverage, the new study also offers greater detail than the previous assessment. Dr Alex Gardner – a research scientist in the sea level and ice group at NASA, who was not involved in the study – says the study is “truly impressive” and that it “adds detail to an evolving record of glacier demise”. He tells Carbon Brief:

“Through the analysis of over half a million satellite images, the authors were able to construct the most detailed record of how glaciers around the world have – and are – responding to natural variability within the climate and, more importantly, to human caused warming of the atmosphere.”

Dr Robert McNabb – a lecturer at the University of Ulster and author on the study – explains that their study is “the first to report elevation and mass change observations for nearly every glacier in the world at the individual glacier scale”.

“For a glacier modeller like myself, the data behind this study really are a game changer”, says Dr Ben Marzeion from the University of Bremen, who was not involved in the study. He tells Carbon Brief:

“For many years, we have had the huge problem of extremely sparse observations, but with the data from [the new study] we will be able to much better constrain the models we use for projecting glacier change and the glaciers’ contribution to sea level rise. We will also be able to assess the models’ ability to represent climate-glacier interaction a lot better.”

Glaciers vs ice sheets

The authors of the new study calculate that, between 2000 and 2019, glaciers collectively lost around 267bn tonnes of ice every year. Assuming that all the water from melting glaciers eventually reaches the ocean, this means that meltwater from glaciers alone contributed 0.74mm of sea level rise every year.

The mass loss from glaciers has also accelerated over the past two decades, according to the study. The results show that the annual “thinning rate” of glaciers was 36cm on average in 2000, but increased to 69cm by the year 2019. It adds that the “mass loss acceleration” of glaciers has increased by 48bn tonnes per year per decade.

To compare the mass loss from different glaciers, the authors assessed the 19 regions shown in the map. They found that 83% of meltwater comes from just seven of these regions: Alaska (25%), Greenland periphery (13%), Arctic Canada North (10%), Arctic Canada South (10%), Antarctic and subantarctic (8%), High Mountain Asia (8%), and Southern Andes (8%).

…[M]eltwater from Alaska has contributed to one quarter of total glacier mass loss during this century. Zemp explains that this is because Alaska is experiencing rapid warming and the region is also densely populated with glaciers.

The study also compares overall mass loss from glaciers with that from melting ice sheets.

The study finds that, between 2000 and 2019, mass loss from glaciers was 47% higher than from the Greenland ice sheet (GIS) and more than twice that of the Antarctic ice sheet (AIS)

The authors also note that, while glacier mass loss “distinctly accelerated” over the entire 2000-19 period, the mass loss from ice sheets decelerated since a peak in the mid-2010s. From this, the authors “infer that acceleration of sea-level rise since 2000, which is often attributed to the accelerated loss from both the GIS and AIS, also substantially originates from glaciers”.

(Literature suggests that the slowdown in mass loss from the Greenland ice sheet was due to two “anomalous cold summers in western Greenland”, while the deceleration from the Antarctic ice sheet was caused by a cumulative mass gain of 980Gt since 2009 in the Queen Maud Land region of the East Antarctic ice sheet.)

The authors estimate that between 6% and 19% of the 21st century acceleration in sea level rise is due to mass loss from glaciers. Meanwhile, they estimate that 21% of overall sea level rise comes from glacial meltwater.

The study also touches on the difference between “marine-terminating” and “land-terminating” glaciers. McNabb tells Carbon Brief that all glaciers lose mass from surface melting. However, marine-terminating glaciers that run into the sea also lose mass from “melting below the waterline and calving of icebergs.”

Marine-terminating glaciers make up around 40% of Earth’s total glacierised area. However, the study finds that they only contribute 26% to the global mass loss. The authors suggest this is because marine-terminating glaciers show a delayed response to climate change compared to land-terminating glaciers.

Glaciers in a warming climate

To understand the main factors that drive glacier retreat, it is important to understand how they gain and lose mass. Each year, snow falls on the glaciers adding to their “mass balance” during the cold season, and meltwater flows away from the glacier during the warm season. This can be explained using the analogy of a bank balance, Zemp explains:

“A glacier works like a bank account. You have the income, which is the snow – mainly over winter – and then you have the expenditure which is the melt, from temperature, solar radiation and so on. You take the balance at the end of the hydrological year to see if the glacier spent more than it gained.

Using this analogy, Zemp tells Carbon Brief that glaciers are currently in a “financial crisis”, because warming temperatures are causing many regions to lose between 1-3% of their remaining ice volume each year.

The maps below show the change in glacier elevation (top), temperature (middle) and precipitation (bottom) between 2000-09 and 2010-19 in the 19 glacierised regions.

In the top map, reds and yellows show areas where glaciers have shrunk between 2000-09 and 2010-19, while blue indicates regions where glaciers have grown. In the middle map, red shows regions that have warmed, with darker reds showing greater warming, while blue shows regions that have cooled. Similarly in the bottom map, green shows regions that have seen an increase in precipitation, and brown shows a decrease in precipitation.

The authors find that many of the changes in glacier mass line up with changes in temperature and precipitation. For example, glaciers in Alaska, western Canada and the US are responsible for 50% of the acceleration in mass loss over the 20th century, according to the study, and the maps show a notable temperature rise and snowfall decrease in these regions.

Similarly, the authors note that there are outliers to the general trend of melting. For example, in Iceland, the glacier thinning rate halved between 2000-05 and 2000-19. McNabb tells Carbon Brief that this was due to a notable increase in snowfall over the area.

The authors find that the impact of temperature on melting glaciers exceeds that of precipitation:

“Although decadal changes in precipitation explain some of the observed regional anomalies, the global acceleration of glacier mass loss mirrors the global warming of the atmosphere.”

Gardner warns that the warming temperatures are putting the world’s glaciers “out of equilibrium” and that the imbalance “will only grow as the full impacts of a warming climate comes into effect”.

He adds that this study should be used as “further scientifically rigorous evidence” of “the urgent need for rapid and collective action to reduce the dumping of greenhouse gases in our planet’s atmosphere”.

To see the maps & other graphics: https://www.carbonbrief.org/melting-glaciers-drove-21-of-sea-level-rise-over-past-two-decades?utm_campaign=buffer&utm_content=buffer5719c&utm_medium=social&utm_source=twitter.com

Economists: A US carbon tax would be progressive

Guest column by Gilbert Metcalf & Lawrence Goulder, The Hill, April 28, 2021

Environmental justice concerns have been at the forefront in discussions of U.S. environmental policy. They have been central, in particular, to discussions of proposals for a nationwide carbon tax to address climate change. While economists tend to favor a carbon tax as the most cost-effective way to promote reductions in emissions of greenhouse gases, progressives and EJ groups often oppose this option on the grounds that it is regressive — that it would disproportionately burden low-income households.

Our own research, conducted independently, finds that this claim is unfounded. We find that a carbon tax is inherently progressive, narrowing the income gap between rich and poor households. Beyond that, we find that it can potentially raise real incomes of low-income households.

It is true that one outcome of a carbon tax works toward regressivity. A carbon tax would lead to higher prices of goods and services, especially those that are carbon-intensive (e.g., electricity and gasoline). There is ample evidence that low-income households spend a disproportionate share of income on these carbon-intensive goods and services; as a result, the higher prices from a carbon tax tend to have a regressive impact.

If this were the whole story, the carbon tax’s overall impact would indeed be regressive.

However, several other features of a carbon tax make it progressive. As some have noted, a carbon tax’s revenue can be returned to households in ways that promote progressivity. The Climate Leadership Council’s “carbon dividend” approach, in which the revenues are recycled in the form of a dividend check of the same amount to every U.S. household, would significantly work toward progressivity.

While this form of revenue-recycling may have many attractions, we find that such targeting is not needed to make the carbon tax progressive. Our work shows that a carbon tax is inherently progressive — a feature that has been overlooked in policy discussions. The carbon tax’s inherent progressivity gives policy makers more options in policy design — they can consider devoting some or all of the revenues to other purposes (such as providing compensation to displaced workers, or financing investments in infrastructure) while maintaining progressivity.

The inherent progressivity stems from other economic responses to the tax.

First, transfer programs in the United States, including Social Security and food assistance from the Supplemental Nutrition Assistance Program (SNAP), are partially or fully indexed for inflation. Lower income households, who rely more heavily on payments from these programs, are more protected from the higher prices of carbon-intensive goods and services.

Second, while much of the cost of a carbon tax is passed through to consumers, a significant fraction of the cost would be borne by owners of capital (i.e., shareholders). That’s because the industries most likely to be affected by a carbon tax are highly capital-intensive. This effect on capital returns is progressive since shareholders tend to have higher incomes.

The two responses above are sufficient to bring about an overall progressive impact.

A third outcome, environmental in nature, would augment the progressivity. In addition to reducing emissions of carbon dioxide (the main objective of the policy), a carbon tax would lower emissions of several local air pollutants correlated with CO2. The associated health benefits are likely to be especially important for low-income households — another progressive impact.

Meanwhile, alternatives to the carbon tax, including regulation and tax subsidies, are much less progressive and don’t provide benefits to minority and low-income households in the same way that a well-designed carbon tax could.

Beyond the dimension of progressivity, the carbon tax has further attractions related to fairness. While progressivity focuses on the relative burdens to low- versus high-income households, the absolute impact on income is an important ethical consideration. A 2017 U.S. Treasury study estimated that households in each of the lowest seven income deciles would on average experience an increase in overall income if the CLC’s revenue-recycling approach were adopted.

Claims that a carbon tax is regressive are simply incorrect. They stem from a narrow focus on just one of the several important channels through which a carbon tax affects people. A more comprehensive assessment reveals that it is progressive and can enhance the quality of life of individuals across the income spectrum.

Gilbert Metcalf is the John DiBiaggio Professor of Economics at Tufts University. He was the Deputy Assistant Secretary for Environment and Energy at the U.S. Department of the Treasury in 2011 and 2012. Follow him on Twitter @GibMetcalf

Lawrence Goulder is the Shuzo Nishihara Professor of Environmental and Resource Economics at Stanford University. He has served on several scientific advisory committees to the U.S. and California environmental protection agencies. 

https://thehill.com/opinion/energy-environment/550691-economists-a-us-carbon-tax-would-be-progressive?rl=1