From today’s Wall Street Journal:

The Apollo Alliance, a San Francisco coalition of environmental and labor groups, also released a study in September. It concluded that five million green jobs could be had with an investment of $500 billion — more than three times Mr. Obama’s number.
Kate Gordon, co-director of the Apollo Alliance, says the numbers are less important than the message. “Honestly,” she says, “it’s just to inspire people.”

Honestly, if it will help inspire people let’s tell them that spending half a trillion on environmental stuff will bring back really cool dinosaurs and give us laser vision to boot.