With all this on my mind, folk of the internet, please pick your climate apocalypse scenario. Of the five options, one is only moderately apocalyptic, one is unlikely to be much of a bother to anyone except the wandering jew, and at least one is arguably already happening, but which do you adhere to? You may pick your favourite, or the one you think is most likely.
If you want to run this experiment in a more measured fashion, climateprediction.net are running a Seti-type "large ensemble" experiment. Download one of two climate models and see where the world is going.