You can not simply be for or against Nature. Everything you do, or do not do, helps some species and harms others. That is to say, that every action or inaction produces both winners and losers, from Daniel Clark, ABC News:
Cats are responsible for the deaths of 1.4 to 3.7 billion birds and 6.9 to 20.7 billion mammals every year, according to research conducted by the Smithsonian Conservation Biology Institute and the U.S. Fish and Wildlife Service.
You can either be pro-bird or pro-cat. Take your pick