Human Survival

[Anomalocaris]

As I said it depends on who you talk to, but as far as greenhouse affects on Earth it is my understanding the sooner rather than later crowd believes the problem here in the distant future is expected to be water vapor as opposed to carbon dioxide. Initial heating due to more energy from the sun, possibly in combination with anthropogenic and other greenhouse gasses, raise the level of water vapor in the atmosphere and cause further heating. Eventually the water vapor vapor will be lost into space but not before it heats the place up more than the current ecosystem can bear.

Who knows though? Maybe by that time we will have the ability to move our planet to a bigger orbit. If we haven't gone the way of the dodo already.

The question is whether the water vapor greenhouse would make the entire surface of the earth too hot for complex ecosystem, or only the equatorial and maybe temporate zone too hot. Recent forecasts seem to suggest many things could constrain the water vapor green house so that higher latitudes would continue to be amenable to complex ecosystems.