Green Glossary – Y

Yard Waste
The part of solid waste composed of grass clippings, leaves, twigs, branches, and other garden refuse.
Yellowstone National Park
The United State's first national park established in 1872 as a protected area. Yellowstone covers grounds from Wyoming, Montana and Idaho.
Yield Factor
A factor that accounts for differences between countries in terms of land productivity. Each year, every country has yield factors for cropland, grazing land, forest and fisheries.