Essays / Argument Essay: Environmental Sustainability [5]

Hello Everyone! My professor has given us an argument essay to write using environmental sustainability as a theme. I'm choosing to write about global warming and how I think it's a hoax/lie and how so much money has been made off of it. How the environment movement was started from it. I just don't know how I would write a thesis statement/question from it. I would greatly appreciate any and all help. Thank You