A growing number of comedians are trying to find some humour in global warming. Greens have brought much laughter to the world, but most of it has been at their expense. The British comedian, Marcus Brigstocke, says he struggles with this problem on a daily basis, more so since he increased his riffs on global warming in his routines following his 2007 Arctic voyage with Cape Farewell, an organisation that brings together artists and scientists to raise awareness of climate change. "It's far and away the most difficult comedy subject IR 17;ve ever dealt with,' he says. "It's tested me to the outer reaches of my ability as a writer.' Mr. Brigstocke is one of a small but growing number of comedians trying to wrestle some humour from climate change. Fellow British comic Rob Newman has been a committed environmental and political campaigner for many years. Recently he was at Hebden Bridge, northern England, doing stand-up at the town's monthly Climate Chaos Kitchen on the subjects of peak oil and climate change. Briton Mark Watson has gone further. In September 2007, he was the only stand-up comedian among a group of 150 volunteers in Melbourne who attended Al Gore's workshop in which the Nobel Peace laureate teaches others how to present his An Inconvenient Truth lecture. The result was Mark Watson's Earth Summit