Even if we manage to get human carbon output under control, we know that historically the earth has gone through very extreme natural climate changes. If we wa

Even if we manage to get human carbon output under control, we know that historically the earth has gone through very extreme natural climate changes. If we want to keep the earth habitable by humans over long time-scale then we absolutely need to learn how to do minor terraforming. Much better to experiment on the moon or mars than the earth.