A good average value for the amount of energy that reaches the next trophic level is about:

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.

it's c. (to reduce the greenhouse effect/carbon gasses)

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