This is my philosophy on the future. Feel free to adopt or reject it as you see fit. Trying to reason about the future on cosmic scales is beyond our current a

This is my philosophy on the future. Feel free to adopt or reject it as you see fit. Trying to reason about the future on cosmic scales is beyond our current and any foreseeable capabilities so let's discount that right away; we don't quite know if the universe will end in heat death (though we have some hints). We don't know if it is possible to create or move to other universes or even whether such a concept makes sense. As long as such things haven't been ruled out we can assume they're true: if life survives to the end of this universe it will have accumulated enough knowledge and technology to create or move to a new one. Back in the present every species on earth is doomed. Whether an asteroid strike or the sun turning into a red giant eventually this planet will become uninhabitable. It is not known whether intelligent life is a common result of evolution or we're a fluke. We do know it takes a very long time if it happens at all. It is possible we are the only highly intelligent species that will ever appear on this planet. The primary responsibility of humanity then is to balance resource consumption with the creation of an interplanetary society first, then eventually an interstellar one. We must protect the earth's resources and preserve as many species as we can reasonably preserve... but we must also preserve modern technology and pursue the establishment of permanent self-sufficient colonies on other worlds in the solar system. Once we do so we must take and spread as many species from earth as we can. In the medium term (next million years) this isn't so important but once we can achieve some form of interstellar movement spreading life to other systems is key to ensuring it isn't wiped out (or reset back to single-cell organisms). We are the only natural process capable of preserving life and so far as we are aware ours may be the only instance of life (or intelligent life) in the universe. What future iterations of life will make of such an opportunity we can only guess, but if we don't do it in all likelihood no one else ever will. If no intelligent life survives then our existence is pointless and will be erased when the sun's red-giant phase scours every last trace that any living thing has ever existed from the face of the earth.