Senate Environment and Public Works Committee Chairwoman Barbara Boxer (D-Calif.) blasted skeptics of climate science Wednesday, alleging they are “endangering humankind.”

“The message I have for climate deniers is this: you are endangering humankind,” Boxer said during a press conference in the Capitol. “It is time for climate deniers to face reality, because the body of evidence is overwhelming and the world’s leading scientists agree.”

Boxer criticized skeptics of climate science, alleging they are standing in the way of significant progress toward lowering greenhouse gas emissions both domestically and internationally.