For a few weeks I have been imagining a super villain. The problem is her only super power is the ability to raise large sums of cash.
She is Dr. Emily Vahl (E. Vahl) head of the pro-Eco anti-human non-profit whose goal is to knock the human population down to 1 million people. 1 million because it is under a billion and the shock of that amount of human loss should help with greenhouse gases and other human caused population. Her organization funds and enhances wars, and develop deadly diseases particularly in 3rd & 2nd world countries. In industrialized countries they try to promote activities that would promote terrorism, and sterilizations. The organization's goals are met in two ways, prevent people from being born and knocking off the ones who were born.
Dr. Vahl sees herself as an alien, sent to rid the Earth of the worst of humanity. She believes the world is better off without humans. There is something mysterious about her that leads her to believe that she isn't human, but it would defy logic to believe she is anything but human. Going in a theological direction, she is an agent of Satan whose job it is to exploit the worse of human behavior and use that to destroy humans. The reason why she heads a pro-environmental group is it is her way of denying the evil of her plans and actions. By making the environment an excuse for her actions she feels justified to do what she does.
I haven't thought of a hero perfect enough to fight her. I did imagine a hero of sorts who also works for a non-profit that likes to go to 3rd world countries and save lives. But the problem is that it costs money to chase Dr. Vahl around. Money, better spent on vaccines.