Don't forget that elimination of sparrows in some regions in China led to a famine with millions dead. Elimination of bird predators like owls and hawks (cause

Don't forget that elimination of sparrows in some regions in China led to a famine with millions dead. Elimination of bird predators like owls and hawks (caused by destruction of their environment and poisons by bad agriculture practices) leads to mice infestations. Civilizations can only function if they don't destroy their ecosystems. We have enough warning examples in the past, let's hope we'll be smarter this time.