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The U.S. promised to slash its emissions and send tens of billions of dollars to low-lying and less well-off nations. The war in Ukraine is delaying that even as the toll from climate change rises.

Building and operating telescopes can generate a lot of greenhouse gases. In fact, it's as if each astronomer in the world was driving more than 100,000 miles per year, a new study finds.

The omicron variant of the not been found in the United States yet. Here's what's we known about it, how dangerous it's likely to be, and whether vaccines or new drugs will be effective against it.

An analysis by NPR shows that since the vaccine rollout, counties that voted heavily for Donald Trump have had more than twice the COVID mortality rates of those that voted for Joe Biden.

The South African government is trying to discourage the use of ivermectin, an anti-parasitic medication, as an anti-COVID-19 therapeutic. But some doctors are prescribing it anyway.

The vote Tuesday by the Food and Drug Administration panel moves the U.S. closer to vaccinating children ages 5 to 11.

A combination of the pandemic and severe weather have disrupted planned blood drives and caused a drop in donations.

Austria has become the first Western democracy to require vaccines for nearly all adults. Everyone who isn't exempt will be required to show proof of vaccination during random checks by the police.

The Parker Solar Probe's first passage through the corona, which lasted a few hours, is one of many that are planned for the mission, according to NASA. The next flyby is expected to occur in January.

More people are buying marijuana since California legalized its retail sale two years ago. But the scientific research to show consumers the risks and benefits of marijuana use is just starting to accelerate.