can measure minute changes in temperature over thousands of years, even when there were no instruments to measure at that time.

However we dont have the technology to tell with absolute certainty if its going to rain tomorrow?

Personally I believe that this whole global warming thing is unproven and no mattter what side the politicians are on, they have a personal agenda to back it up their beliefs.

It gets too Hot.... Global Warming
It gets too Cold.... Global Warming
It rains too much... Global Warming
It doesnt rain enough... Global Warming
Hot Dogs come in packages of 10 and buns come in packages of 8....... Global warming

Doug