Birds, descendants of the dinosaurs, have survived for so long

because they know how to adapt to a changing environment. By

contrast, humans, who haven't been around all that long, have

chosen a different survival strategy, namely, to make the

environment adapt to them. With over six billion humans

now on the Earth, some say this strategy is working. Others say

birds will be around long after the last human and the last

water faucet have vanished from the planet.