What oil companies knew: the great climate cover-up

Oil firms are said to have known for decades of the link between burning fossil fuels and climate breakdown. Author Bill McKibben describes how industry lobbying created a 30-year barrier to tackling the crisis. Plus: John Stewart on his campaign to stop the third runway at Heathrow. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>