The story is indeed a good fiction, but not qualified to be a science fiction. The earth is obviously the only and the most suitable planet for life in the universe according to any known evidence. It will continue to be the case in the foreseeable future. With scientific and engineering development and innovation, the problem facing the earth can be overcome, as the earth is fundamentally best positioned in the known universe, assuming uneducated politicians and activists (including rich Hollywood celebrities) don't interfere in the scientific and engineering development. Even though the earth environment deteriorate to the state ridiculously described in the movie, it is still the best planet according to the knowledge in the foreseeable future.