Yes, the climate of the world has gotten warmer, and then again colder....ice caps melted and then reformed, all before man even appeared on the scene. What is different this time is the incredible rate of change and what is driving the change.
The Koch brothers hired a very well regarded climatologist by the name of Richard Muller of UC Berkley to confirm their position that burning fossil fuels has nothing to do with global warming. Mr. Muller was chosen because of his reputation and because he too was very skeptical of the notion that global warming was connected to the use of fossil fuel.
After an exhaustive review, he was convinced his previous opinion was wrong and that global warming was caused ENTIRELY by human activity.
Funds for this study were provided for by the Folger Fund, the Bowes Foundation, the Lawrence Berkeley National Laboratory, the Bill Gate's Fund for Innovative Climate and Energy Research , the Koch Foundation, and the Getty Foundation.
I do not know if the Koch brothers asked for their money back.
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