Nearly two-thirds of Earth's life-supporting ecosystems, including clean water, pure air, and stable climate, are being degraded by unsustainable use.....and that's at today's levels of pollution. The global economy will double in size in the next 25 years. If we have  the same  model of growth the earth's LIFE SUPPORTING ECOSYSTEMS WILL COLLAPSE. The planet will be essentially dead for habitation by humans.

 It's an undeniable fact that CO is increasingly acidifying the oceans and this will eventually kill the sea plants such as plankton that supply the oxygen we need to live.
Plankton population is already down 40%.
Fish stocks are in catastrophic decline.
Massive dead zones off all the major rivers due to agricultural chemical and topsoil runoff.
There is an island of plastic garbage , made from petrochemicals, the size of France in the Pacific.
If the earth staggers along for 50 more years the global economy and it's waste output will quadruple.
More fossil fuels =human extinction