Conceding that he is no expert in science, Times’ letter editor Paul Thornton, says “when deciding which letters should run among hundreds on such weighty matters as climate change, I must rely on the experts — in other words, those scientists with advanced degrees who undertake tedious research and rigorous peer review.” He continues, “Saying ‘there’s no sign humans have caused climate change’ is not stating an opinion, it’s asserting a factual inaccuracy.”