text: A week ago, it emerged that the Oscar-winning film director had put his money where his mouth is by donating $1m of his personal fortune to opponents of Proposition 23, a ballot measure facing voters in California at the coming mid-term elections which would suspend the state's landmark law combating climate change. Supporters of the proposition weren't going to take that lying down, though. On Thursday, they returned fire by releasing a short film that claims to highlight a Titanic-sized gulf between Mr Cameron's somewhat magisterial proclamations regarding the importance of combating climate change, and his actual lifestyle.