Climate Change - What's the Range of Possible Temperature Changes?

IPCC estimates that there are 1,460 to 1,600 gigatons of carbon dioxide or equivalent quantities of other greenhouse gases stored in permafrost. A bropped thawing could cause up to half of these trapped greenhouse gases to be released immediately with the rest released more gradually over decades. The IPCC thinks it's unlikely that clathrate emissions will cause substantial warming in the next few centuries. Research into methane clathrate release appears underdeveloped, so there's a lot we don't know and this contributes to our overall uncertainty on how hot it will get.