Mostly it is one “event” per day on this site. Sometimes (like today) it is hard to choose. So-
1973 – “Soylent Green”, the first Hollywood film to reference (very briefly!) global warming, is released.
2002 – The Bush/Cheney regime succeeds in ousting the chair of the Intergovernmental Panel on Climate Change – “April 19, 2002 (ENS) – Transatlantic divisions over climate change were reconfirmed today when Dr. Robert Watson, the outspoken chairman of the Intergovernmental Panel on Climate Change (IPPC), was ousted with American support but against European wishes.”
2010 – In the backwash of Nopenhagen, “The World People’s Conference on Climate Change and the Rights of Mother Earth Cochabamba”