Meet the climate change mercenaries - people trying to make a profit out of global warming. Presenter Justin Rowlatt travels to Greenland where Prime Minister Aleqa Hammond hopes the retreating ice will create business opportunities - such as the successful gold prospecting. We hear about the opening up the fabled North West shipping passage across the Arctic. Justin encounters some profitable creepy crawlies - the flies being reared to provide a valuable source of protein, and the sterile mosquitos to combat dengue fever. And it's not just insect farming. Greg Smirin of Climate Corporation explains his firm's weather forecasting services and why they have just got together with agriculturual behemoth Monsanto. And Justin hears from a pair of winemakers about the future for British viticulture.