A video from the Extreme Ice Survey in which Dr. Tad Pfeffer and photographer Jim Balog discuss the dynamics of the Columbia glacier's retreat in recent years through this time-lapse movie. Key point: glacier size is being reduced not just by glacial melting but due to a shift in glacial dynamics brought on by climate change.

This video provides an overview of changes happening in the Arctic.

This static graph of changes in CO2 concentrations goes back 400,000 years, showing the dramatic spike in recent years.