The world population, March 2016 7.4 billion, will increase to 11.2 billion in the year 2100. (Wikipedia) At a discussion here we found that population here must be lowered drastically there was a suggestion then that we colonise another planet & move.
Conditions have to be right to develop into living organisms. Then the possibility exists that those simple organisms could evolve into more complex life forms, and perhaps into intelligent beings who could build telescopes to look out into the cosmos and ask the same question as us: “Is anyone else out there?” See: Bob McDonald has a site……
If all 7+ billion of us were to enjoy a European standard of living – 60% the consumption of the average American – the Earth could sustainably support 2 billion people.
Global aquifers are being pumped 3.5 times faster than rainfall recharges them, so they will run dry. Topsoil is lost 10-40 times faster than formed. Feeding 7+ billion of us will become difficult. Oceans are being overfished, and a primary protein source for over 2 billion people is in jeopardy. Worldwide, we have lost over half the vertebrate species.
See: 3 Times Sustainable