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The pandemic has hindered climate data collection from ships and buoys in the oceans. The U.N. warns it could negatively affect climate models' accuracy unless scientists find new ways to gather data.

The former vice president called out the former president during a speech Friday, saying it's "un-American" to think that one person could determine the outcome of an election.

The ozone layer is a thin shield in the stratosphere that protects humans and the environment from harmful levels of the sun's ultraviolet radiation.

The head of the U.N.'s atomic watchdog agency on Sunday condemned a Ukrainian drone strike on one of six nuclear reactors at the Russian-controlled Zaporizhzhia Nuclear Power Plant in Ukraine.

Of the 34,000 objects above and all around us, three-fourths are out of service or just debris that presents a threat to our safety and our communications.

After more than 50 years of conflict, Colombia's largest guerrilla group officially disarmed and is transitioning into a political party.

Fierce fighting continued overnight in eastern Ukraine along the Russian border, and Russia's foreign minister rejected U.S. claims that his country has been supporting pro-Russia fighters there.

A settlement may mean the release of thousands of inmates from solitary confinement. The U.N. special rapporteur on torture says it's "a great achievement," but he'll have to see how it's implemented.

Secretary of State John Kerry visits Saudi Arabia to nudge the key U.S. ally to find a way out of a devastating war in Yemen. The United Nations human rights chief is calling for an international inquiry.

As President Trump accepts North Korean leader Kim Jong Un's invitation to meet him, questions remain about whether the State Department has enough experts on hand to engage in serious negotiations with North Korea over its nuclear and missile programs.