As I commented on another site:
"And on your right we're approaching a planet formerly known by its now extinct dominant species as Earth. Humans, as they called themselves, once showed great potential to become a part of the galactic community, but since the advent of their species' industrialization, they continually worked against their own self-interest by pouring massive amounts of pollution into the planetary biosphere, poisoning themselves and tripping a runaway environmental disaster. The species finally self-destructed completely and took out what was remaining of the planet's biosphere with the advent of a brief, yet devastating nuclear conflagration over the planet's dwindling resources and various factions' god-myths."