Unusually warm weather spurred an early peak of blooms for tourists in D.C.
The lack of ice on Lake Superior this winter puts the average decline in ice coverage over the past 40 winters at 79 percent.
A new estimate lowers the amount of heat necessary, and thus the time needed, to melt the Greenland ice sheet
According to scientists, Death Valley's Ubehebe Crater may be ripe for another explosion.
A few hippos surface from a pond in the Maasai Mara national reserve in Kenya, an area heavily affected by prolonged drought.
A miko, or shrine maiden, walks as snow falls at the Meiji Shrine in Tokyo, Japan.
Delicate ice crystals are formed from the snow during a cold, calm night.
A warming climate is killing off yellow-cedar trees on more than 500,000 acres of Southeast Alaska.