Just a lot of hot air!! 
For me, thank goodness I learnt how to swim when I was at school all those years ago. Them teachers and the education department must have known something of the future and the consumption of the planet would come back and bit us on the bum!
As for the doom-sayers, there is one thing about the human race, we can adapt and fix the problem in the end.
If I have my way, the population of the Earth's six billion odd inhabitants would be reduce to below 50 or 100 million over the next generation or two. (Not extermination per se, but by cutting the birth rate to near absolute zero, and just let Nature take its natural course!)
It is the best Greenhouse or Global Warming method - reducing populations, which in turn reduces the emissions and consumption to a far more reasonable level.
One of the things humans have great difficulties with is not modify our behaviour to adapt to the environment. If the environment is under great stress, then the best way to is take the pressure off is to change the population to improve survival using reasoning instead of let Mother Nature ravish life in a
mass extinction on the Earth as a reaction to our own
stupid actions.
So if we
don't change the end, will be certainly deserved extinction, whose last days of an overpopulated Earth will like be food as Solent Green - with a character in the Charlton Heston vein casting the last stone and laughing his tail off!. Zaius was right when he said in the 1970
Beneath the Planet of the Apes movie; "
You ask me to help you?! Man is evil, capable of nothing but destruction!"
Also as stated in the very final words in narration of the same movie ;
"In one of the countless billions of galaxies in the universe, lies a medium-sized star, and one of its satellites, a green and insignificant planet, is now dead." 
Please!