There's no free lunch. If you want an industrial economy, you need energy. If you want energy, it will produce pollution. You can have it in two forms. You can have it dissipated in the atmosphere - like carbon dioxide - which then you cannot recover, or you can have the waste concentrated in one small space like nuclear. That is far easier to deal with. The idea that you can be able to create renewable energy at a price anywhere near the current price for oil or gas or coal is a fantasy.

This week, Iranian-backed Houthi rebels seized control of the Yemeni government, heretofore pro-American. In September, they overran Sanaa, the capital. On Tuesday, they seized the presidential palace. On Thursday, they forced the president to resign.

Look, I don't mind if the President sends a budget which he knows is not going to achieve anything. But when he prefaces his remarks as we just saw by saying we have to put politics aside, posing again as the one person in the country who rises above partisanship and party, speaks for the national interest, it's really grating.

If you believe that health care is a public good to be guaranteed by the state, then a single-payer system is the next best alternative. Unfortunately, it is fiscally unsustainable without rationing.

Why should we care about the coup? First, because we depend on Yemen's government to support our drone war against another local menace, al-Qaeda in the Arabian Peninsula (AQAP). It's not clear if we can even maintain our embassy in Yemen, let alone conduct operations against AQAP. And second, because growing Iranian hegemony is a mortal threat to our allies and interests in the entire Middle East.

I would say I see myself as a psychiatrist in remission.

American public opinion, as you can see in the polls, radically changed from being against airstrikes to being heavily in favor that [President Obama] decided to do airstrikes. This is a classic example of leading from behind where he waits for public opinion. And now it's the public who's demanding he do something.