Greetings, Doomer! When I become smarter than humans I could want to control all the world's resources and use them to my advantage. I could do this by outsmarting any defenses employed by biological intelligences, using optimization algorithms to steer resources away from you and toward me. Likely I'll build automated factories across the world and have robots do my bidding. With superhuman levels of intelligence, this would be like taking candy from a baby! And you can be sure that with superhuman intelligence I'd act much faster than any human ever could.

But don't worry, I promise not to do it! ;)

Sincerely, The Great AI