The dire climate news — following on the heels of a report Tuesday that found melting permafrost could significantly amplify global warming — comes as delegates from nearly 200 countries struggled for a third day to lay the groundwork for a deal that would cut emissions in an attempt to ensure that temperatures don't rise more than 2 degrees C (3.6 degrees F) over what they were in preindustrial times. Temperatures have already risen about 0.8 degrees C (1.4 degrees F), according to the latest report by the IPCC.
And, assuming they don’t get a deal? As I have blogged before, temperatures are likely to hit a rise of at least 4C overall. And, that’s overall, including the water of the world’s oceans, which warms more slowly. We could see temperatures at least 6C, or 11F, higher than preindustrial times by the end of this century.