I was first introduced to the idea of terraforming a world from Carl Sagan’s 1980 television series, Cosmos. He introduced the idea that if we discovered no life on Mars, it could possibly terraformed and made into an Earth-like planet. He discussed the possibility of planting dark green plants on the polar caps to warm them and free the trapped oxygen and any water that might be there. It was a romantic notion and even then, he implied the technical innovations required would likely be far in t...