If one only looks at the data from the last 800 years, then one might conclude that the rise in temperature since the industrial revolution might have something to do with human activity on the planet. But when one goes further back in time one quickly realizes that we probably have little impact on global temperatures. Greenland, after all, wasn't always covered with a sheet of ice, hence the name GREEN-land. http://wattsupwiththat.com/2009/12/09/hockey-stick-observed-in-noaa-ice-core-data/

Scott

My HT