Earth under the Boon
Earth has been subdued by highly advanced visitors from another world. The Boons. Those sudden invaders managed to bring all governments under their control with limited damage to the populations.
Problem is, those invaders are the most pragmatic beings in the cosmos, and they are not happy about the way Earthlings managed their precious ressources. Global warming threatens the globe, giant patches of garbages litter the forests and oceans, food isn't properly produced, water is inequitably available...
Trying to be merciful, the aliens accept not to cull the population. They decided to check if Earthlings can change their ways. As such Arbiters have been dispatched in some countries to check if the population can be redeemed. While some parts of the world present potential in respecting the environnement, some prove to be rather stuck in their ways.
And so, thousands of rehabiitation candidates try to live their lives as they normally would, sort of. Reporting daily on a device, they try to change their ways, at least a little. "I walked to work today." or "I bought food that showed that fair-trade label you told me about." are the sort of things Boon Arbiters look forward to.
How will this Earth evolve under the boon of those ecologically-friendly destroyers?