I stumbled across an amazing time-lapse history of atmospheric CO2 this morning.

Beginning with data from Mauna Loa, Antarctica, and local signals around the world - and moving backwards in time (incorporating data from numerous sources, including ice cores and other proxies) - the magnitude of exactly what we're doing to this planet emerges.

The video reconstruction is about 3 minutes long.  Watch it all the way through - full screen mode is recommended.