Transients on this scale, however, could last hundreds of years. Even on Mars, CO2 takes a while to escape from the atmosphere; on human time scales we'd see a

Transients on this scale, however, could last hundreds of years. Even on Mars, CO2 takes a while to escape from the atmosphere; on human time scales we'd see a new metastable Martian temperature. (Assuming a bunch of CO2 actually were dumped into the atmosphere, that is.)