...Are we already fucked?
...As far as global warming is concerned, have we already done the damage & created a now more or less irreversible heating trend?
I've been reading-up on the information, and as far as I understand, the current model predicts the following:
Given a sufficient propagation of CO2 throughout the atmosphere, a positive feedback loop will be triggered on the Earth as ice sheets melt and marshlands thraw-out, resulting in increasingly less sunlight reflection and further release of carbon gas into the air. Once started, this system essentially feeds itself without any further mechanism necessary; the initial catalyst is just that, a catalyst. Reducing manmade emissions after the feedback loop has started will do nothing.
...Uh. So, has the feedback loop started already? If it hasn't, do we know roughly how much CO2 in the atmosphere can increase before it does start?
If it has started... do we know roughly how hot the Earth could get? Presumably it wouldn't get up to, say, Venus's level of heat, given it's proximity to the sun?
"Natasha has just come up to the window from the courtyard and opened it wider so that the air may enter more freely into my room. I can see the bright green strip of grass beneath the wall, and the clear blue sky above the wall, and sunlight everywhere. Life is beautiful. Let the future generations cleanse it of all evil, oppression and violence, and enjoy it to the full."
- Leon Trotsky, Last Will & Testament
February 27, 1940