I have no idea if a 40% change in carbon dioxde in the atmosphere would cause a drastic temperature change in the atmosphere, but I do know that ecological environments on Earth require a niche and just a few degrees change can have a massive impact. But rather than guess using my limited scientific knowledge (I'm not an environmentalist by trade, and the question you pose is awfully rooted in subjectivity), I trust the actual people who are (people who research and publish for decades on the subject): [url=http://example.com]http://climate.nasa.gov/scientific-consensus/[/url] Again, [i]global warming[/i] is not the only environmental issue facing us, and seeing as how you for a second time have failed to comment on anything else leads me to believe you're conditioned in some way to reduce the topic to an abused talking point.