Some, actually many, argue that the government has done the same thing that big tobacco has done, hired their own scientists by funding those who agree with their pre-determined outcome and not funding those who may disagree.  As for me, I remain open minded about the causes of climate change and consider it expedient and wise to use our natural energy resources carefully with a view that mankind has at least contributed toward global warming.  I think the problem is much too complex and has too much pre-human history to burden the last 150 years with the onerousness of that responsibility.  I don't think that science has yet completely defined the causes of climate change.  That being said, we all still have a responsibility to use our resources wisely with a view toward the possible damage that we could be causing.