Humans have obviously had a significant impact on the Earth. We've killed off various species and built stuff that may long outlast our grandchildren (e.g., the pyramids, the Long Now clock
, nuclear waste facilities, etc.). At some point, we might want to think about what we'll leave behind after we're gone ourselves. Here are just a few links on planning for the future for our world.
If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post