Readers discuss his role in the government shutdown negotiations. Also: Trump austerity; G.O.P.’s future; clean energy; guns and young people.

Jigar Shah and Robinson Meyer discuss how the decarbonization rollout can continue during the second Trump administration.

The promise of deeper emissions cuts will very likely be ignored by the Trump administration, but officials hoped it would send a signal to the world.

© Kim Raff for The New York Times

Climate purity is a recipe for failure.

When President Biden visits Angola on Monday, he will promote a rail project meant to show America’s commitment to the continent and to counter Chinese influence.

When President Biden visits Angola on Monday, he will promote a rail project meant to show America’s commitment to the continent and to counter Chinese influence.

The financing plan, which calls for $300 billion per year in support for developing nations, was immediately assailed as inadequate by a string of delegates.

The Chinese economy is more dependent on exports, making tariffs more potent, yet it’s less reliant on American markets and increasingly bent on self-sufficiency.

A surge in power use worldwide could make it harder for nations to slash emissions and keep global warming in check.