Lost Voices 22: Gryphon by Crawford Kilian
By Crawford Kilian
Del Rey 
Synopsis: Three hundred years ago, humans contacted aliens. Although interstellar travel is impractical, many species belong to an interstellar communications network, giving them access to a vast database of ancient information. Humans were able to decipher and understand a millionth millionth of the data and with it, raise a few millions of us to great heights of luxury while wiping out the rest. By the twenty fourth century, only twenty or so million humans are left, mostly isolationist immortals. As well, the side-effects of a few million spoiled godlets making their own individual gardens of Eden have destroyed most of the native ecosystems of Earth.