I'd say even a minor risk of global warming (and the evidence points to that risk being far from minor) merits a large - scale shift away from coal. (dotearth.blogs.nytimes.com)
In 1988, several landmark events highlighted the growing risks of global warming, elevating the issue to broad public awareness. (ucsusa.org)
Earlier this year, he announced that he is looking at whether Exxon Mobil ignores the true risk of global warming in evaluating its energy reserves. (leftexposed.org)