Suppose that co2 in the atmosphere was held at a constant, natural level for a few thousand years. then, co2 was added to double the atmospheric level rapidly, and this new, doubled level was maintained for a few thousand years. what was the most likely change in the typical average temperature of the planet? temperature before the increase in co2 was a few degrees higher than temperature after the increase. temperature before the increase in co2 was a few degrees lower than temperature after the increase. temperature before the increase in co2 was the same as temperature after the increase. temperature before the increase in co2 was 30 or 40 degrees lower than temperature after the increase. temperature before the increase in co2 was 30 or 40 degrees higher than temperature after the increase.