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Taken just nine days apart, two images illustrate the impact a recent warm period had on the Antarctic Peninsula. NASA says such warmth "has become more common in recent years."

Australia's volatile fire season saw "one of the worst days on record" this weekend, as record-breaking temperatures and low humidity exacerbated conditions.

Despite the president's criticism of the alliance, his administration has spent far more on a European defense program than did the Obama White House. U.S. troop levels in Europe have also risen.

The talks showed deep divisions, as small countries highly vulnerable to rising seas and powerful storms were at odds with wealthy, high-emitting countries like the United States.

Employers added a whopping 339,000 jobs last month, a stunningly strong number. Here are some of the key takeaways of the country's red hot labor market.

The CDC is officially recommending a third dose of the Pfizer or Moderna vaccine for people with weakened immune systems. It follows the FDA authorization a day earlier.

After the attacks, barriers and thigh-high cement bollards sprouted up seemingly overnight in Washington, D.C. But new threats show the need for adaptability.

Most of the 39 trapped miners have reached the surface after climbing more than half a mile on a series of ladders. The Totten mine elevator system was damaged on Sunday.

Shortly after researchers unearthed the mummified body of a 55,000-year-old Steppe bison in the Alaskan tundra, they sliced off a piece of its neck. To eat!

NBC correspondent Richard Engel announced that his son Henry, who had been diagnosed with Rett syndrome as an infant, died on August 9. Here's what to know about the disorder.