How do goats help our environment?

Most goats eat underbrush like tree leaves, some weeds, and many grasses. After eating these weeds and plants, goats convert its biomass into milk. If someone were to use a fossil-fuel powered lawnmower or "weed-eater," they would hurt the environment in the following ways:
  1. Pollution, such as carbon dioxide, sulfur oxides, hydrocarbons, etc., would be created
  2. Excess noise would be generated
  3. The biomass in the dead grass and weeds would be left to decay into the soil to provide nutrients for new weeds to grow, thus re-creating the weed-growth cycle.
But if a dairy goat ate the underbrush, the weeds and other plants would be converted into milk, a fuel for either humans or other animals. No pollution would be expended, and most goats are quiet.

In some parts of the country, dairy goats are hired out to work as weed-eaters. This provides the preceding environmental benefits on a larger scale.

Also, goats are far more efficient than cows. This means that for every gram of feed given to a goat, an average goat will produce more milk with it than an average cow would.