Land surface area of earth = approx. 148,000,000 km^2 Current human population = approx. 6,500,000,000 For discussion's sake, let's hypothesise that approx. 1/30 (one thirtieth) of the land surface area was set aside for people's living areas. I chose 1/30 simply because I thought it would quite likely take account of space needed for other species, areas for transport, industrial areas etc.. (chose 1/50 or another figure if you want). I could have gone wrong somewhere in my calculations, but as far as I can tell, that would leave us with approx. 6.5 billion people living on approx. 5 million km^2. This would mean approx. 770 m^2 squared per person. That's a considerable amount of space! If the area were square, it would equal approx. 28 metres by 28 metres. You could even grow the food you need on that! Let's further hypothesize.... Suppose the population increases to 10 billion.... actually... let's say even 12 billion. 12 billion people living on approx. 5 million km^2 would mean approx. 415 m^2 per person. Again... for an area of square shape this would mean just over 20 metres by 20 metres. My point is... I think the alerts about the global population putting strains on our planet are perhaps unfounded. Unless I have seriously messed up somewhere in these (rather easy, i confess) calculations, I believe is there is plenty of space for everyone. ...Hold off on the vasectomy! And whatever you do, don't commit suicide because someone who is seriously misled tells you there are too many people on the planet! Opinions please!