Business Green: Global Warming is already responsible for 300,000 deaths a year and results in annual economic losses of $125bn, according to a major new study on the human impact of climate change. The report was released today by the Global Humanitarian Forum, a think tank run by former UN secretary general Kofi Annan, and is being touted as the first comprehensive assessment of the human impacts of climate change. It calculates that climate change is already having adverse effects on 325m …