Smarts don’t make you an expert on climate dynamics, and I don’t trust some guy on Twitter to be a good judge of “smart”. The phrasing is pretty telling though “smart people I know”, vs “people smarter than me” means he’s including himself among the “smart people” pushing for this.
Tech people are the worst at believing their specialized knowledge of one tech field makes them experts in all fields, including history, economics, and branches of science mostly unrelated to their own.