For once we are in agreement <G>
The earth was warmer in Leif Ericsson's day. I guess it was all those greenhouse gases being created by the crazy Vikings.
Earth's temperatures have always been variable, cycling between ice ages, temperate weather, and hot periods. But global warming could certainly help push the leftist agenda, so I'm sure you'll be convinced of it's reality.
This winter was bitter cold for many- don't worry, the global warming crowd said that was a result of , you guessed it- global warming.