http://www.helium.com/knowledge/251706-why-we-will-never-have-too-much-carbon-dioxide-in-our-atmosphere.xml Helium.com > Climate Change > Why we will never have too much carbon dioxide in our atmosphere en-us Copyright Helium.com Thu, 02 Jul 2009 23:01:23 GMT Thu, 02 Jul 2009 23:01:23 GMT