If Jesus came back today, He might look around at creation, recalling its pristine beauty, and lament that this precious earth has been made into a den of thieves by greedy corporations and wealthy countries that gobble up resources from the rest of the world.  When there is nothing left, no fresh air to breathe, no life in the oceans and the soils are sterile from chemicals and overuse, we will have our Judgment Day. We are expected to be good stewards of this earth, including of the oxygen and CO2.