Republicans should try self-inflicted suffocation to grasp the harmful effects of climate change on human health, said Florida Democrat Alan Grayson at a hearing Wednesday.

“Regarding my friend from California, if he thinks [carbon dioxide] doesn’t cause any health problems, I invite him to put a plastic bag over his head, tie it tightly around his neck and see what happens next,” Grayson said during a House Science, Space and Technology Committee hearing on the Energy Department’s clean energy budget.