Guardian: 1965: The White House first acknowledges the risks of climate change, just a few weeks after Lyndon Baines Johnson becomes president. This generation has altered the composition of the atmosphere on a global scale through radioactive materials and a steady increase in carbon dioxide from the burning of fossil fuels, Johnson tells Congress on 8 February 1965. That November, he tells Congress the burning of coal, oil and gas is adding 6bn tons of carbon dioxide to the atmosphere every year. Global...