Despite falling ethanol prices and some plant cutbacks, Morgan Stanley thinks ethanol makers, as well as solar energy companies, have a lot of long-term potential.

According to an AP report, analyst David Edwards initiated coverage of the clean energy industry with an “Attractive” view.

“The global risks posed by climate change are driving spending and investment in clean energy solutions, which (unlike the oil shock that spawned the first wave of alternative energy solutions in the 1970s) is durable and accelerating,” he wrote in note to investors.

He sees the “annual clean energy revenue opportunity” reaching $500 billion in 2020 and $1 trillion in 2030.