Human role in warming 'more certain' - UN climate chief

Scientists are more certain than ever that greenhouse gases from human activities are heating the planet, the head of the UN's climate panel says. Rajendra Pachauri made the comments in an interview with BBC News. via Pocket http://www.bbc.co.uk/news/science-environment-24204323#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa