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The Biden administration's approval of California's electric vehicle mandate sets up a protracted fight.

The move will almost certainly be reversed by the incoming president.

His agencies are leveraging California's vast market power to prod the auto industry to ramp up production of battery-powered vehicles -- regardless of what the incoming president wants.

The Energy Department assessments homes in on the economic risks to warn that exporting more gas could raise domestic energy costs.

Researchers attending the American Geophysical Union conference worry their work could disappear when a president who rejects climate science takes office.

The new heat record comes as Donald Trump prepares to return to office and undo the Biden administration's efforts to combat climate change.

Developing nations got a promise of at least $300 billion in climate finance from rich countries such as the U.S. and the EU's members. They wanted far more.

Big-money pledges will be even harder to trust. Fossil fuel producers have more leverage. China is ascendant.

The pledged financing from the U.S., EU and other wealthy governments includes hopes for private money -- and a Trump-sized asterisk.

Dominance of clean energy technology has allowed China to cement its influence with developing nations, overwhelming more meager efforts by the U.S. and Europe.