Does TNR work?

When China hosted the Olympics in Bejing they removed all the feral cats from the city to make things look better. Two years later the city is once again over run with feral cats and to make things worse, many of those cats moved into the city from the surrounding farmlands because the city provided better food and shelter. Now they are rounding up city cats and creating what they call “cat armies” to take back to the farms which are now having horrible problems with rats and mice! They are also working to control the city cats through TNR since the trap and “remove” did not work. Nobody knows what happened to the cats they caught in the big city Olympic cleanup.