The short-term focus of humanity sometimes worries me as we keep making mistakes that are likely irreversible and preventable. Passenger pigeons were once estim

The short-term focus of humanity sometimes worries me as we keep making mistakes that are likely irreversible and preventable. Passenger pigeons were once estimated to be the most abundant bird in the world. There were so many that no one thought they could ever go extinct, until they did in the early 20th century. Ignorance befell twice when people failed to realize a bird that would "darken the skies" could go extinct like any creature and that their breeding habits weren't as straight forward as one would assume. Passenger pigeons would only breed in large flocks, so by the time that anyone realized they were doomed and tried to breed them, there weren't enough pigeons left to form a flock of significant size. Some might argue the pigeons or even the chestnut/elm/ash are not a regrettable loss, but miss the point--that our assumption we can easily undo the damage we cause to the planet is not always possible. The trees might make a comeback from genetic engineering eventually, but bringing animals back from extinction is still more theory than application.