In approximately 4.5 billion years the sun with swell to red giant state, engulfing the orbit of Venus. The earth will be turned to an atmoshpereless nickle and iron cinder. Aproximately 100 million years later the sun will swell to red super giant state, engulfing the orbit of Earth. The planet will then be utterly destroyed. It is likely, however, that some other event will wipe out life on earth years before any of that happens. So what's the point then? Why advocate for any kind of "preservation of the Earth" other than for momentary and selfish reasons?