New Washington’s Ice Age has frozen most of the planet for decades.  We’ve saved or cataloged the native plants and animals, and environmental domes across the planet protect our cities and many wild lands.  Outside the domes, only the equatorial zones are habitable, though filter masks are required against the continuing volcanic ash.  We are trying to repair the damage, but this is more of a Terraforming project now than a clean up project.  Not cheap, not easy.