Wool is a great alternative. Lamb is produced from natural renewable resources like grass, along with weeds and brush that would otherwise grow uncontrolled to create fire danger. Sheep are unique grazers, preferring weeds and providing a service in clearing them from fields and forests to improve plant and wildlife habitat. And all while creating a nutritious meat product essential to daily nutritional balance. That's the long and short of it.
Sheep provide a tool to help the environment.