Summertime sea ice in the Arctic reached a minimum on September 10 (unless it goes lower still). It's now tied for the second-lowest minimum in the satellite era.
Satellite images of the crack in Antarctica's Larsen C ice shelf. If it breaks off, it'll make an ice island in the Southern Ocean as large as one of the smallest U.S. states.
Native plant diversity in forests of northern North America is declining due to an invasion by earthworms introduced hundreds of years ago from Europe.