Mounting development is a grave threat because of how it is carving up an ecosystem that must stay relatively intact to function.

The envoy, Kevin Rudd, said that he had removed the posts “out of respect for the office of the president.” But it was a sign of broader anxiety over Donald J. Trump’s return to power.

© Michael Reynolds/EPA, via Shutterstock

Beijing is expecting more volatility and competition with the United States, though a lackluster economy may limit China’s options for pushing back.

© Kevin Frayer/Getty Images

Beijing is expecting more volatility and competition with the United States, though a lackluster economy may limit China’s options for pushing back.

Plus, Republicans win control of the Senate.

© Doug Mills/The New York Times

Western officials are investigating whether devices planted at shipping hubs in Europe may have been a test run by Russian operatives for placing them on planes bound for the U.S.

© Jens Schlueter/Getty Images

What we learned from interviewing nearly 700 Americans over almost three years.

What we learned from interviewing nearly 700 Americans over almost three years.

Why opposing Trump is not so completely obvious, obligatory or a matter of simple common sense.

The historian Gary Gerstle discusses how America’s political consensus has shifted over the decades.

Unlikely friendships can make America a better place.

Readers discuss Democrats’ concerns that her bid will throw the election to Donald Trump. Also: Harris ads; drug-free treatments; regretting email.

Biden takes aim at a neurotoxin all around us that impedes brain development.

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

A gallon of regular gasoline in August was down nearly 12 percent from a year earlier, reflecting a fall in oil prices as well as a decline in demand.

John Podesta is expected to push for China to set more ambitious greenhouse gas targets.

Despite war in the Middle East and political turmoil in Libya, investors are focusing on what look like ample global supplies.

In discussions in Beijing, the two sides made clear that many differences remain over Taiwan, technology export controls and trade disputes.

The proposed merger of Japanese and American industrial giants, which proponents say would benefit both countries, is ensnared by political and labor opposition.

Alarmed by the prospect of increased tariffs on Chinese goods if Donald Trump is elected, some American companies are stockpiling parts and delaying expansions.