Ten percent of the big fish still remain. There are still some blue whales. There are still some krill in Antarctica. There are a few oysters in Chesapeake Bay. Half the coral reefs are still in pretty good shape, a jeweled belt around the middle of the planet. There's still time, but not a lot, to
I would think flying would be pretty cool. You would be able to fly away from all your enemies and get where you're going much faster. But being invisible? You probably wouldn't use that for the good of man.