I think part of the negativity is the expectation that we'll eventually screw up any other plant we inhabit as well. No, Mars or Venus are as hostile, more hos

I think part of the negativity is the expectation that we'll eventually screw up any other plant we inhabit as well. No, Mars or Venus are as hostile, more hostile probably than what would result if we screwed up the earth utterly. Radiation, lack of atmosphere, lack of sufficient gravity, lack of the resources that millions of years of life give. These aren't small problems. Humans are extraordinarily dependent on the conditions of life on earth. That might be changeable in the long term but sending rockets into space isn't really related to such change. Extreme revolutions in biology and materials are whats needed.