The earth's climate has always shifted dramatically...
Irreversible climate change makes geoengineering unavoidable.
It is impossible for humans to avoid geoengineering in the future. The earth's climate has always shifted dramatically throughout its history. The Earth will, for instance, enter another ice age fairly soon. Should we, then, just allow this to happen? No, particularly if it means sacrificing millions of human lives and civilization as we know it. We should make the world work for us, not allow it to obliterate us. And, if we assume geoengineering is enevitable, then there is no moral boundary to doing it now, when global warming poses the threat that does to human civilization.