I think people are hopeless because while we are starting to move in the right direction, it's probably too little and too late. Moderation of CO2 emissions might have been enough 20-30 years ago, but now we need immediate radical action to prevent extreme changes in the planet's climate and that's not happening.
Regardless of how much money there is to be made in this market (and you're right, there's a lot), Earth is going to be a very different place to live in 50 years unless we rapidly make dramatic and fundamental changes to the way we produce and use energy.