My opinion is that nobody can prove that carbon emissions are dangerous for the planet or not. I mean, prove in a mathematical/scientific way that cannot be refuted.
So, my opinion is that climate change or not pollution does not do any good and can only hurt the environment.
So even in doubt, why should we keep on cutting trees, pouring toxic waste into the ocean and rivers, and emitting all sorts of toxic pollutants into the atmosphere? What good does it do?
Also, the real cost of oil should include the environmental cost (cleaning after ourselves) and also the cost of "producing" oil, which seems to take thousands of years if not millions to create. Today, the cost of oil is actually only the cost of discovery + extraction. In that sense, it makes sense to find a way to make the price of oil move toward its real cost.
I honestly believe that if cleaner energy sources haven't made their way through is because the major oil companies are preventing them from emerging.
Then, government taxes are probably not the solution to the problem, specially goverment like Obama's.
But it doesn't mean that the problem is not real.