The ExxonMobil oil refinery in Baton Rouge, Louisiana.

Environmentalists are challenging the EPA’s repeal of the “endangerment finding,” which empowered it to regulate greenhouse gases. Whether or not the action holds up in court, now is the time to develop climate strategies that can be pursued when the political balance shifts.

By Jody Freeman

ANALYSIS

Overshoot: The World Is Hitting Point of No Return on Climate

With warming set to pass the critical 1.5-degree limit, scientists are warning that the world is on course to trigger tipping points that would lead to cascading consequences — from the melting of ice sheets to the death of the Amazon rainforest — that could not be reversed.

By Fred Pearce

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Healthy ochre sea stars on Vancouver Island, Canada.

Oceans

Sea Star Murder Mystery: What’s Killing a Key Ocean Species?

Billions of sea stars, victims of a deadly wasting illness, have perished over the last decade, imperiling marine ecosystems and spurring a global hunt for a biological or environmental culprit. Recently, researchers identified a likely suspect, but the case is far from closed.

By Nicola Jones

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