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The U.N. climate summit's landmark decision sets aggressive targets for cutting greenhouse emissions. It also promises more aid for developing countries, but many of those countries wanted more.

First, they were struck by illness and then by medical bills they couldn't pay. Here are 15 stories of Americans living under the shadow of health care debt.

Young people say they want to be included in the COVID conversation.

"I can state with a high degree of medical certainty that George Floyd did not die from a primary cardiac event and he did not die from a drug overdose," cardiologist Dr. Jonathan Rich says.

Research into the evolution of tardigrades has been severely hindered by a lack of fossils. This new discovery could offer researchers insight into how the creatures lived millions of years ago.

The country has taken in the most refugees escaping war in Ukraine by far. Families, volunteers and nonprofits have sprung into action to care for them.

French forces killed the leader of the West African ISIS affiliate in a drone strike in southern Mali in August. French authorities described Adnan Abu Walid al-Sahrawi as "enemy No. 1" in the region.

Stalled confirmatory trials and lax enforcement plague the Food and Drug Administration's accelerated approval pathway for pharmaceuticals that target urgent medical needs.

Forest fires are threatening groves of gigantic sequoias in California’s Sierra Nevada mountains that are home to some of the world’s largest trees.

During three of the last four recessions before the COVID-19 pandemic, income inequality grew in California. Researchers are trying to figure out if the same happened in 2020.