One quick point, to add to my global warming summary from last month.
The constant references to CO2 as "dirty" or a "pollutant" both in popular discourse and in recent Supreme Court decisions is unscientific and rather annoying. Carbon dioxide (a) has been ubiquitous in the atmosphere for as long as there has been organic life, (b) is absolutely essential for the continued existence of organic, including human, life, and (c) is utterly harmless to humans (and all other forms of life) at current concentrations (or any level of concentration contemplated even in the most apocalyptic scenarios).
If CO2 is an atmospheric "pollutant," it is difficult to imagine what component of the atmosphere, including oxygen and water vapor, is not a "dirty" "pollutant."
