There's no chance that these predictions will all come true. But there' s a good chance that some of the doomsday scenarios will come true - primarily because such copious amounts of CO2 were never spewed into the atmosphere.
Predictions about fluctuating monsoon intensities could have serious consequences for a massive population. Balmy arctic summers and significant sea level rises might well prove to be the undoing of humanity.
The latter seems pretty much bound to happen. Sea levels are all set to increase - because a warmer planet will inevitably mean more melted ice (which is currently sitting on land). Water levels will go up, come may .
And I am not too optimistic about action by humans. The west will try to use this as an excuse for stopping the poor nations from developing - and the poor nations will not stop developing. I expect that the 4c rise in temps will be pretty munch inevitable.
This is proof that I live in a trigger happy and delusional county.
How many people in this place know that Iran is 3 times as large at Iraq? Iran is a middle class country, not a poor country. Taking military action against Iran (a) will be extremely unethical because you're exposing a lot of people to danger - an argument that does not go down well in the US - just look at what has been done to Afghanistan and Iraq (b) will not be as "easy" as Iraq has proven to be, given the size of the Iranian economy (c) will not be good for global crude prices, which will mean costlier fuel in these recessing times.