An Interesting Website

Here seems to be a great web site discussing climate change in a sensible
way:

http://www.pbs.org/wgbh/warming/

Their ultimate conclusion:

To sum up--there's no smoking gun to prove beyond doubt we are already
changing the climate. But, if current trends continue, the amount of CO2
entering and accumulating in the atmosphere will go on rising. Given the
vast reserves of fossil fuels, sooner or later we will put enough CO2 into
the atmosphere to force a climate change. Just what this climate change will
be, nobody knows. But once we have changed the atmosphere, it will take
hundreds of years to return to the way it was before the industrial
revolution.