"We all believe what the scientists have been telling us for years now, that this is a matter of urgency and national security, and it has to be dealt with in a serious way," Obama said. "We have the opportunity now to make jobs all across this country, in all 50 states, to repower America. ... We are not going to miss this opportunity," he said.
OK, now if you want to argue that "green energy" has some sort of positive externalities in regards to the environment or national defense, you might have an argument, I am not saying it would be a good one, but you could at least make it, but to argue that it is an economic benefit in that it provides jobs, is a fallacy. Under no circumstances is it an economic benefit to subsidize people to do things in a manner which are a less efficient application of resources than they would otherwise. If solar power costs $20 per megawatt, and coal costs $10 a megawatt, it is never an economic benefit to pay someone $20 extra per megawatt in order to get them to put up solar cells. You might as well just use coal and pay them $10 to surf the Internet for Carrie Underwood videos.
This tactic, commonly used by politicians is a variation of the Broken Window Fallacy, by which you argue an economic benefit to smashing windows in order to employ window repairman, but at a loss to society as a whole.