In an article on the political landscape in California, Anne Smart, writing for Huffington Post, cites AEE's report, Advanced Energy Jobs in California. From the article: 

In this state, fighting air pollution isn’t just a good deed ―it’s good business. According to a study by the Advanced Energy Economy, employment in clean energy grew 18 percent in 2015, with more than 500,000 Californians spending some or all of their time in the clean energy field.

Read the full article here.