What is the best way to handle the animal control issues we have today?

There is a general consensus that the euthanizing of animals to make space for new animals in shelters is a bad idea. If we believe this what are some other practical and viable options that are available to shelters? What are the actions we can take on a personal, local and national level? Or, if you feel that the euthanizing process is the best, why do you thing this?

Thanks,
Team Animal
Bozsho