@jgl infrastructure and human impact aside, in terms of biodiversity, Hong Kong is unique (especially for a city), and as we face extinction of biodiversity, like insects, I think it's a ll the more pressing to embrace the patches, however small, of wilderness that we have. For example, of all the butterfly species in China, Hong Kong has a quarter. In an ecological sense as far as I understand, they are very important to the world. I believe there are a few hillsides that are wholly untouched (north face of Lin Fa Shan). I also like the idea of reintroducing large predators and think we irrationally prioritize our own sense of human safety in a way we'll one day regret when so many species are wiped out forever. But it's just a fun fantasy... Sigh.