To admit that we, humans, has had a hand in destroying the only planet we can survive on, would mean taking responsibility for the rape of this planet for money and power. So we have many on river denial and cities of heads in mall sand. Because it interfears with business as usual. On it goes. Clean air, water and food is negotiable if money, position and power is needed.  Look at ethenol  mega fields across northern old feed corn fields. Fools are crapping in their only nest. No other planets to go to. Thank God he trapped humans here on Earth,  cause it would just repeat  itself elsewhere. Wonder what population will live like in another 70 years?