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A look at the economic backdrop to today's summit meeting between President Obama and Chinese President Xi Jinping.

Brazil's Environment Ministry announced that deforestation in the country has increased by 16 percent. A separate study warned that more than half the Amazon's tree species may be threatened.

Scientists meeting in San Francisco issue their 2016 report card. "The Arctic as a whole is warming at least twice as fast as the rest of the planet," one says, and it is getting progressively worse.

Temperatures at the North Pole are expected to be 40 to 50 degrees higher than normal on Thursday. Zack Labe, a doctoral student at the University of California Irvine, explains what's driving the temperatures up.

Fewer hurricanes have made landfall on the coast in the past decade. Research suggests a bipolar relationship between conditions in the Atlantic and along the coastline may have a protective effect.

Six senators sent a letter to Scott Pruitt, President-elect Trump's pick to run the EPA. They want lists of donors and details about meetings with energy lobbyists ahead of his confirmation hearings.

In her memoir, Mary Robinson speaks of her experience advocating for social causes and her personal convictions after growing up in a deeply Catholic family.

The crew hopes to be the first to row through the fabled Northwest Passage in one season aboard a custom-built 23-foot boat.

For months, starting in late 2015, a gas leak in Los Angeles spewed methane into the air. The Southern California Gas Company has agreed to reimburse local governments and mitigate the damage.

Multiple nuclear power facilities in Europe have reduced their electricity production because seawater, which is used to keep the reactors cool, has been warmer than usual.