"The only thing that scares me more than space aliens is the idea that there aren't any space aliens. We can't be the best that creation has to offer. I pray we're not all there is. If so, we're in big trouble."
A new controversy : Consider a species with good population and enough resources to sustain itself on earth..What happens next ? It multiplies and consumes more resources until the resources can no more sustain the species and hence extinct.
But, man learned to grow crops, raise fire, heal and build. How was it possible and who made it possible ? Our Alien space brothers ?