Global warming threatens to reverse human progress and make international targets on halving world poverty by 2015 unattainable, a study published today said. The claim comes from charities including Greenpeace, Oxfam and Action Aid who have joined forces, under the banner of the Working Group on Climate Change and Development, to release the report, called Up In Smoke, in London today. http://www.guardian.co.uk/climatechange/story/0,12374,1331637,00.html