Good points shadfurman.
I have yet to have a global warming supporter explain to me how man can impact the temperature of the planet when Mt. Pinatubo released millions of tons of sulfer dioxide in one day and caused global cooling for 3 years.
And Mt. St. Helens did the same thing for 2 years when it blew it's top.
And yet a volcano right now is sending enough CO2 into the atmosphere every day to equal the monthly CO2 output of Brazil. Even including the Amazon burning.
How did the earth go through a warming trend that raised global temperatures to the point Greenland had vineyards during the early Middle Ages without industrialized man causing it?
How do you think Greenland got it's name? It was once 100% ice free into the Middle Ages when Vikings saled the seas around it. On the scale of history the glacier on Greenland now is a child of the earth.
How did the earth go into the Little Ice Age that ended in the 1700's with out mans industral influence warming the planet?
The global warming people don't know the answers to these questions. Mother Nature wins this argument every time.