Back from Africa; CO2 is a pollutant

I returned from South Africa on Sunday. A wonderful trip. More to say later.

Meanwhile a significant development on the climate change front: The US Supreme Court ruled today that "the Environmental Protection Agency has the authority to regulate carbon dioxide from automobile emissions, and has shirked its duty in not doing so." This was in a case brought by Massachusetts and other states. Justice Paul Stevens argued: "E.P.A.'s steadfast refusal to regulate greenhouse gas emissions presents a risk of harm to Massachusetts that is both 'actual' and 'imminent.'"