Mother Nature Network: Theres been much talk in recent years of climate feedback loops and runaway climate change, whereby the warming of our climate through man-made greenhouse gas emissions triggers further warming in the form of natural responses such as the release of methane and carbon dioxide by melting permafrost or the huge emissions caused by out-of-control wildfires. Respected NASA scientist and vocal advocate for climate action James Hansen has even claimed a runaway climate change scenario could destroy...