1. Arctic Sea Ice Summer sea ice extent is steadily shrinking in the Arctic Circle due to warmer temperatures. Click on the image to view a visualization of satellite data over the past five decades.

2. Visualizing Change Satellite data show that Antarctica is losing hundreds of gigatonnes mass per year. Click on the image to get an idea of how big one gigatonne actually is.

3. Retreating glaciers

Glaciers are retreating worldwide. This stunning example is in Switzerland. See more examples from Alaska at https://contrib.pbslearningmedia.org/WGBH/ipy07/ipy07-int-glacierphoto/index.html