The other aspect to consider is that, as humans, we need space to work and live. This inevitably will come at the expense of the natural environment. Some species will suffer, some will suffer more than others. The only way around that is to tell people to stop having children, to stop living, and to stop advancing society. We have to balance all of these when we consider land utilisation.
I am far from convinced that this post takes a reasonable view of all these points. It is quite common for environmental extremists to make highly irrational decisions (germany shutting down nuclear plants in favour of coal?). Only one side of the argument seems to be considered in this post.
An old boss taught me that I should never oppose an action without having an alternative viable course to propose. I think those of us who care for the environment (I care, a lot) would advance the cause by following this advice.