Earth

As higher elevations warm, melting glaciers and disappearing snow will create major challenges

Sea ice is the thinnest it's been at any time in the last 30 years, and wild reindeer and caribou populations continue to decline

Marine heat waves, drought and heavy rains in 2017 all bore the fingerprints of climate change

Road de-icing, industrial activity and other culprits are pushing salt levels in rivers and streams to alarming levels

Just 13 percent of the ocean remains largely untouched by human activity

In the last few decades blue whale calls have been getting lower in pitch—and a rebound in their numbers may be the reason. Christopher Intagliata reports. 

A short ferry ride reveals the awesome power of subduction

The enormous crater is among the 25 largest known on Earth, and likely came from a meteorite impact within the past three million years

Wind farms can cause a cascade of ecological effects, but are still needed to provided cleaner energy supplies

The planet may be more sensitive to warming that previously thought, making climate goals more difficult to meet

A tour of Woodlawn Cemetery in the Bronx, N.Y., focuses on the geology of the landscape and the mausoleums.

Once upon a rocky planet there was the weird, the wonderful, the spooky geology!