Legal experts said the president was testing the boundaries of executive power with aggressive orders designed to stop the country from transitioning to renewable energy.

© Doug Mills/The New York Times

Officials and business executives at the annual gathering in Switzerland said the fight against global climate change would continue with or without the United States.

© Markus Schreiber/Associated Press

In a sweeping order, President Trump halted federal approvals for new wind farms, in a move that could affect projects on land and in the ocean.

© Joe Buglewicz for The New York Times

Critical CO₂ stores held in permafrost are being released as the landscape changes with global heating, report shows

A third of the Arctic’s tundra, forests and wetlands have become a source of carbon emissions, a new study has found, as global heating ends thousands of years of carbon storage in parts of the frozen north.

For millennia, Arctic land ecosystems have acted as a deep-freeze for the planet’s carbon, holding vast amounts of potential emissions in the permafrost. But ecosystems in the region are increasingly becoming a contributor to global heating as they release more CO₂ into the atmosphere with rising temperatures, a new study published in Nature Climate Change concluded.

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© Photograph: Andrew Burton/Getty Images

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© Photograph: Andrew Burton/Getty Images