Joining the familiar white-collar and blue-collar labor-market designations is the eco-focused “green collar” class of jobs:

According to a report by the American Solar Energy Society, there are currently 8.5 million green collar jobs in the U.S. and by 2030, this number will likely balloon to 40 million or about one-quarter of the total workforce. And, the jobs listed are just in the renewable energy and energy efficiency sectors and don’t include other types of environmental employment.

No need to point out that green is the color of money.