Glacier Icemelt in Alaska
The retreat of Pedersen Glacier in Alaska. Left: summer 1917. Right: summer 2005. Credit: 1917 photo captured by Louis H. Pedersen; 2005 photo taken by Bruce F. Molnia. Source: The Glacier Photograph Collection, National Snow and Ice Data Center / World Data Center for Glaciology.
We can already see the effects of greenhouse gases and global warming in melting glaciers in many parts of the world like Alaska.