Just curious---thousands of years ago there was 2 mile thick ice on the property I own here in western Washington. Since this no longer is the case, doesn't it appear we have been in a global warming situation since way before the industrial revolution. Could we blame this whole thing starting on the original inhabitants of earth?

http://www.scientificamerican.com/ar...-last-ice-age/

Probably not due to our Bedrock ancestors driving Stone Utility Vehicles, or herds of mammoths belching and breaking wind.

If by "original inhabitants" you mean phytoplankton, they probably helped cause some big ice ages:

http://russgeorge.net/2014/03/22/new...-last-ice-age/

DH