Today: Move by EPA would reverse legal determination that greenhouse gases threaten public health; carbon-removal projects fell short last year; why Trump might be onboard with a carbon-offset program for aviation.

Welcome back: The Trump administration is planning this week to repeal the Obama-era scientific finding that serves as the legal basis for federal greenhouse-gas regulation, according to U.S. officials, in the most far-reaching rollback of U.S. climate policy to date.

The Journal's Meridith McGraw and Benoît Morenne report that the reversal targets the 2009 “endangerment finding,” which concluded that six greenhouse gases pose a threat to public health and welfare. The finding provided the legal underpinning for the Environmental Protection Agency’s climate rules, which limited emissions from power plants and tightened fuel-economy standards for vehicles under the Clean Air Act.

The final rule, set to be made public later this week, removes the regulatory requirements to measure, report, certify and comply with federal greenhouse-gas emission standards for motor vehicles, and repeals associated compliance programs, credit provisions and reporting obligations for industries, according to administration officials.

The move is likely to be seen as a victory for the fossil-fuel industry, which for years has pushed back against federal climate regulations. Since taking office, President Trump has sought to repeal rules that his allies in the oil-and-gas industry have cited as overly burdensome. Trump has framed fossil fuels as vital to economic and national security, and he has argued that expanded reliance on them will help lower energy prices.

Carbon-removal projects significantly underdelivered in 2025, according to a new report, as worries over technological readiness and funding hit the nascent sector, Yusuf Khan reports.

Permanent carbon-removal methods—including biochar, bioenergy with carbon capture and storage, or BECCS, rock weathering and mineralization—fell short of sequestration targets, according to a study by Supercritical.

More than half of biochar projects underdelivered last year in terms of volume forecast, said the report from the carbon-removal platform. For a method long considered the most technologically mature in the sector, 54% of projects failing to meet their removal targets is a standout figure. Biochar projects heat biomass in the absence of oxygen to create a charcoal-like material—this is then buried, locking in the emissions.

Pat Adams, senior writer at Supercritical, said the main issue was funding.

A United Nations carbon-offsetting program for airlines known as Corsia has everything that one might expect would repel the Trump administration: increased costs for consumers, efforts to combat climate change and international cooperation, writes Henry Kronk.

But behind the scenes at least, the president’s team has backed the rollout of the initiative that calls for the use of sustainable aviation fuel and carbon credits, even as Trump has pulled back from other international emissions-reduction efforts.

Carbon market experts generally believe the U.S.’s Corsia policy will follow the lead of the country’s airlines. And U.S. airlines want to minimize compliance costs. If Corsia doesn’t succeed, these companies will face the risk that their flights could be regulated by many different decarbonization efforts around the world, leading to confusion and costly mayhem.

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• Ford disclosed an additional $900 million tariff hit after reporting its largest-ever quarterly loss on electric-vehicle-related charges. (WSJ)
   
• Honda Motor’s car business incurred an operating loss of 93.4 billion yen, impacted by U.S. tariffs and EV-related impairments. (WSJ)
   
• BP suspended its share-buyback program amid a broader plan by the British energy giant to overhaul its business. (WSJ)
   
• Neara, an Australian startup that makes digital models of power grids, has raised more than $60 million to accelerate its expansion. (WSJ)
   
• Reduced ice cover in Greenland opens the potential for more sea routes in the Arctic region, giving easier access to its critical minerals. (FT)
   
• Global businesses are undermining the environment despite relying on it for raw materials and services, say more than 150 countries. (Bloomberg)

WSJ Pro Sustainable Business gives you an inside look at how companies are tackling sustainability. Send comments to bureau chief Perry Cleveland-Peck at perry.cleveland-peck@wsj.com and reporters Clara Hudson at clara.hudson@wsj.com and Yusuf Khan at yusuf.khan@wsj.com. Follow us on LinkedIn at perrycp, clara-hudson and yusuf_khan.