We humans are on track to more than double the atmospheric co2 concentration that existed for the few millennia before the industrial revolution. if we could cause just a doubling and then hold the co2 level constant for the next thousand years, we very likely would see: a. the earth would cool and cool, eventually causing a new ice age. b. the earth would warm many tens of degrees, and then the temperature would stabilize at that new, warmer level. c. the earth would cool a few degrees, and then the temperature would stabilize at that new, cooler level. d. the earth would warm a few degrees, and then the temperature would stabilize at that new, warmer level. e. the earth’s temperature would remain the same as it was before the start of the industrial revolution