The left is quite proud of its love of science. Their beliefs, their policy proposals, their wordview is based on science, or so they say. As such, science should be the sole objective measure of what is good for the people, and what is not.
We are in the midst of Lent, the time when Christians recall the 40 days Christ spent in the wilderness and overcame the Devil's temptations. Many people make vows to abstain from certain pleasures or luxuries during this time -- a symbolic way to overcome their own temptations. For a few, there is no greater temptation than carbon, which they have decided to abstain from using (but not too much) during the Lenten season.