Today humanity begins to live in debt. It ends August 2, the stock of natural resources allotted to us for the entire 2017. And already begin to take away the resources that actually are designed to have the following.
The earth can not cope with the replenishment of the stock of wood, edible plants, fish and other things, that forests, fields, rivers and seas independently, without human intervention.
Interestingly, in 1987 this point of no return came on December 19. And in 2030 will fall to the middle of the year, that is, humanity will need double the resources that the planet can reproduce all over the year.
Need to find a second Land or build it yourself. Otherwise, the last day of the earthlings eat up the remnants and will remain completely lifeless planet.