Couldn't this have happened 50 years ago when we still had clean air and water, fish in the oceans and a rainforest???
I'll never understand the attitude that we need to have 2.4 children to keep the population growing... no, we're a virus on this planet and as a species, we could quite easily achieve all that we are now, and maintain genetic diversity with as few as 2000 people... but let's say a safe million. Anything more than that is arrogance, indulgence, ignorance...