My response to another blog.

The primary thing we must emphasize is the millions of unwanted feral and roaming pets outdoors is a critical environmental problem, not an animal welfare issue.
There are tens of millions of the cats, perhaps as many as a hundred million, and most ecologists and biologists agree they murder as many as a billion of our birds, mammals, reptiles, amphibians, and fish each year, many of them threatened or endangered.
Our precious fauna is rapidly vanishing from habitat loss, pollution of our air and water, and the unnatural predation of cats. The unwanted pets are being abandoned at exponential rates, due to the bad economy and the proliferation and perpetuation of cat colonies by their enablers. This situation must be changed while some of the extinction may still be reversible.