The 21st century has not been kind to the water levels in Lake Powell, a meandering reservoir that straddles the border between Arizona and Utah. This series of images, taken by NASA’s Landsat satellites from 1999 to 2015, document the change.
Not all ice is created equal: this view of the Amundsen Gulf has open ocean, older thick ice, young thin ice, fresh snow and even broken brash ice adrift at sea.
This image, taken by Expedition 41 aboard the International Space Station, looks like the fine artwork of some extra-terrestrial, but it's actually decades old scarred earth and entrenchments of warfare along the Iraq/Iran border.
In the last several hundred years, human activity has shifted large quantities of the world's carbon from long-term storage (i.e. carbon bound up in rocks, fossil fuels, and forests) into forms of short-term storage such as croplands and pastures, which tend to store less carbon for shorter periods of time.
The September equinox occurred this morning at 5:05 am EDT, marking the official start of Fall for those of us in the Northern Hemisphere. Twice a year, during the latter halves of March and September, every person on Earth experiences the effects of an equinox in the form of a 12-hour day followed by a 12-hour night.
Earlier today, a giant dust storm swept over all of eastern Australia, the worst the area has seen in 70 years. The storm also brought hail and strong winds. And it's a menacing cloud even when seen from space.