Postlethwaite next starred in a Liverpool stage production of "King Lear" in 2008 at the Everyman Theatre, Liverpool, and at the Young Vic, London. He appeared in the climate change-themed film "The Age of Stupid", which premiered in March 2009. Having recently installed a wind turbine in his garden, he said was impressed by the film and wrote in "The Sun" newspaper that, "The stakes climate change are very, very high. They're through the roof. How could we willingly know that we're going into extinction ... and let it happen."