Sustainable earth means banning automobiles today. Also Banning Coal Fired and Nuclear Power plants. Rationing air flights and meat consumption should come in a close second, and then changing to hydro/wind/solar and tidal power should follow ASAP. Take all gas station attendants, car builders, and other effected by the switch to mass transport only and hire them to clean up the oceans. (At the same pay they used to make, with money saved by ending war.) Ban GMOs! Voila! Eternal life for humans on earth. Maybe less humans, but a livable earth.