You'd be surprised what we could get to work if the survival of humanity depended upon it. You'd better believe we'd get self sustaining bio domes working tout de suite if that were the only way to ensure our survival.
It could be difficult to see the forest for the trees. In this model the sea level rising would flood many of the largest cities on earth, resources would certainly be focused on managing the onslaught of climate refugees that result.
OTOH, the Manhattan Project occurred during a time of near-total war; so there's hope.
We could solve the problem, sure, but it's a race against time while society is crumbling, in this scenario.