19th century tourists watching a devastated Alaskan glacier collapse.

Between 1794 and 1879, the glacier at Glacier Bay, Alaska retreated eight feet per day. This was probably due to something which Sarah Palin’s great-great-great-great-great-great-grandfather did.

http://soundwaves.usgs.gov/2001/07/glacierbaymap.gif

We now know that reducing CO2 levels to 350 ppm will cause glaciers to stop melting.