Adding geologic weathering cycles to a wiki climate article

The wiki climate article Long-term effects of global warming has been criticized from reputable sources (not the usual scruffy crew) as being alarmist. To fix that and because it seemed like a good place anyway, I've added a short section on how the oceanic absorption and geologic weathering over many thousands of years will eventually take care of the CO2. It's here, but could use some additional info.