My sentiments too. There are lots of suns with similar spectra, but none very close to us, and the biochemistry of life on any other planet is unlikely to be very useful to us. Minor differences in biochemistry would render the plants and animals there, if not fatal to us, at least not very nourishing. Even right here where we evolved there are plants and animals that are fatal to ingest. We'd have to transplant earth's biota as well as ourselves, and nobody knows how they'd grow on an alien planet under an alien sun. Better to preserve what we know works here.
The real issue, behind pollution, global warming, resource depletion, habitat loss, mass extinctions, and all the other ecological and environmental problems we face, is that there are just too many of us here. 6 billion people simply cannot live here at the level of consumption we have in western Europe and North America. We are a plague on the planet. Nature has ways of taking care of such things, and they're always painful and brutal in terms of human values. Pestilence, famine... Evolution is the ultimate weapon of mass destruction, and if we don't limit our numbers, nature will do it for us in the cruelest ways you can imagine.