The issue focused on by many as the single biggest risk to the UK's economic future is climate change. But who are the key players in the debate?But can we really trust that this government's climate change policies will really help to avoid this danger?This has been the subject of much debate in recent months.It was also the subject of the 2010 International Climate Change Conference in Copenhagen.It was there that the decision was taken to increase the global maximum temperature from 2C to 2.6C. But this