Power
You can kill deals. Or at least delay them indefinitely. That's power. Defense power, anyway.
Because of your substantial smarts, people will listen to you. Sure, those people may technically have more power to directly evoke change than you do, but you're that little voice in their ear, that angel on their shoulder. And if that doesn't work, you can always point out that you're trying to save the Big Blue Marble and appeal to the heart, assuming the big bad corporate polluters still have one.
You have the ability to sway minds, and you don't even need a hypnosis spinning wheel or a dangling pocket-watch.