The Obama administration today announced its plan to cut carbon pollution levels by 30 percent by 2030. The plan is widely being called the strongest action ever taken by the US to curb the effects of climate change. But the move — which bases its target on carbon levels recorded in 2005 — isn't just big for the US, it's also big for Obama himself, as the president is making use of the executive authority he possesses under the 1970 Clean Air Act to implement the regulation.