Okay. I'm not going to argue that humans are perfect. We clearly are not. But, I hold to my claim that were better off now than at any other time in human history.
The ongoing growth in human population and resource consumption is changing the planet in fundamental ways. One consequence of this growth is the loss of biodiversity, which is typically estimated either by the net movement of species towards higher categories of extinction risk or as the rate at which species are actually going extinct. By either measure, biodiversity loss is on the rise. As species disappear we lose both known and unknown benefits they provide
Apart from the loss of richness to the human experience if ecologies are lost, there much we don't understand about the complex web of life and how it will ultimately affect us, for our own survival it is logical to maintain as much of the Worlds biodiversity as we can