According to a number of scientists, there's a ten-year global warming delay from CO2 release before it causes a Greenhouse temp rise.
So we would expect to see the global temp rise, some of them say, of one degree per year. Since we were at ~1.9 degrees above baseline in February 2016, we've only got a two degree additional rise until every tree on this planet is dead (according to Dr. Guy McPherson who has degrees in forestry. He said he can't imagine a single tree on the planet at 4 degrees C global temp above baseline.)
Four degrees C is just an average. At higher latitudes it will get even hotter, as the North Pole showed this year by being 30-50 degrees above normal. The temps are referenced to pre-industrial 1750 baseline for a human extinction date of 2026. We won't be here if the average becomes 10C above baseline.
Considering these terminal likelihoods, loss of the EPA is not something I'm going to worry about. We are already doomed, since there is no way to put all this released heat back into the ground.
We need a Salt-Water Ring system, like Saturn has. Pump the rising ocean into orbit. Good luck with that, NASA.