No I think we'll have to part company in the end on this one, because I truly believe we are definitely on a major planet change far beyond 5200, or even a million years ago. I would like to know how much fossil fuels we've burn't already as that is what will show us how far we are going to change the planet. My best guestimate is quite a few million years in the past.
GHG's are just a trigger, and even most GW scientists accept that as the case (Cbacba's CO2 doubling and quadrupling is partially correct, just not the current figures he's hawking). What Cbacba totally ignores is what even slight increases in heat can and will do to the planet setting off nearly unstoppable chain/compensatory/equilibrium reactions where the planet will not find a stable "lacking major changes" climate for another five hundred years. Then we'll be either be seven to sixty metres underwater or having the worst ice age "total ice over" (500 year predictions).
If you ignored GHG's for a second I understand your version where the solar heating causes greenland to melt, causes a slow down of the thermohaline (which I'm not sure if it will now), europe goes into an iceage, increasing albedo at the exact same time the sun dies down doubling the effects of an ice age.
An ice age I believe will be easily stoppable in the fact that even total freeze overs in the past were fixed up by GHG's from volcano activity. But man can easily speed that process by pumping out strong GHG's, possibly methane or carbon tetrafluorides (depending on how poisonous they are) to warm the planet back up. Methane is great as it only has a ten year lifespan, the CO2 off it can last a while though. But then again carbon black on ice sounds great.
I don't know if we can really kickstart the thermohaline again if it does slow to a crawl just by dumping salt into the ocean at strategic points though.
You've also pointed to another end of the world disaster that could happen millions of years into the future, what happens when the Uranium 235 gets used up by the planet and the core starts to cool down?
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