Solar System Day - Transterrestrial Musings: "Back in the seventies, many of the L-5ers were hippies who recognized the peaceful potential of space colonization to gently depopulate the earth and make it into a giant natural park, with the vast bulk of humanity living and producing off planet the wealth, via industrial-intensive processes, that would make such a thing affordable. I wasn’t a hippy, but I thought then, and still think, that a wonderful ultimate goal."
This is a wonderful ultimate goal. The earth isn't fragile but humans as a species are if we let ourselves be. The earth has survived several large asteroid hits but it has been the dominate lifeforms that have had the problems with it not the planet.