Why Trap, Neuter, Return?

Why Trap, Neuter, Return?
It is estimated that tens of millions of feral and stray cats freely roam the United States and rapidly breed. Lack of action and ineffective approaches have resulted in a serious population problem. Attempts to rescue all feral cats and find them homes is neither feasible not possible given their numbers and limited socialization. Trap-Neuter-Return (TNR) is the only method proven to be humane and effective in controlling free-roaming cat population growth.