From 1956! Nineteen fifty-six. And way back around 1859 to 1861 John Tyndall was first figuring this out. The only thing that they were wrong about was how fast the planet would warm and the subsequent rapidity with which the entire climate system would begin to spin out of control. Climate change is as real as the blue sky on a sunny day and we have known about it for literally centuries. Anything to the contrary is extremely dangerous denial of a fixable problem with solutions that benefit every life form on Earth.
Scott Kruitbosch
Conservation & Outreach Coordinator