Part of earth that contains all ecosystems

biosphere

Explanation:

biosphere

The biosphere is made up of the parts of Earth where life exists—all ecosystems.

I think the answer is the Biosphere

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

equal distribution i think.