Twenty-five years ago, on this day, April 1, 1998, American climate scientist Michael Mann’s paper about temperatures during the last thousand years was released. http://www.desmog.uk/2015/04/04/how-creation-mann-s-hockey-stick-led-counter-attack-climate-deniers The amount of carbon dioxide in the air was roughly 368.8ppm. As of 2023 it is 419ppm, but check here for daily measures. The context was The Second Assessment Report […]