 They wanted us to think that it was kind of fringy people. But scientists who worked on it were always the leading lights of their nation. So that in 1859, the leading British scientist of his era, a man named John Tyndall, worked out that carbon dioxide and water vapor are the reasons that the earth is warm. Just as a quick thing so that people listening will understand what I mean. Why shouldn't why shouldn't people get a quick primer on this science?