No one makes fact of the population explosion in the last century.There is cause and effect in all our actions. Give it some thought. 150 years ago there were maybe a million carbon based fuel engines in the world.Today there are twice that number or more in America ,who knows the global number.The planet has not grown or shrunk significantly in eons.Natural and human actions are causing things we can not fathom.But there is a bright side to this, we die!