Every year, sea ice cover in the Arctic Ocean shrinks to a low point in mid-September. This year it measures just 1.44 million square miles (3.74 million square kilometers) – the second-lowest value ...

Climate 101 is a Mashable series that answers provoking and salient questions about Earth’s warming climate. The last time CO2 levels were as high as today, ocean waters drowned the lands where ...

The Pliocene epoch, which lasted from 5.3 million to 2.6 million years ago, was a consequential time in Earth's history. The Isthmus of Panama formed, connecting North and South America, and the ...

From the ancient sludge of lakebeds in Asia’s Tibetan Plateau, scientists can decipher a vision of Earth’s future. That future, it turns out, will look very similar to the mid-Pliocene warm period – ...

Year-round ice-free conditions across the surface of the Arctic Ocean could explain why the Earth was substantially warmer during the Pliocene Epoch than it is today, despite similar concentrations of ...

Emissions of carbon dioxide – the gas most responsible for global warming – continued to rise in Earth's atmosphere in 2022, federal scientists announced recently. Carbon dioxide (CO2) in the ...