ANSWERS: 1
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About one billionth of the sun's energy hits the earth. Approximately 7 percent of the amount striking the earth reaches green plants, and 2 percent of that is used in photosynthesis. Using simple math, 0.14 percent of the energy hitting the earth is actually used by plants--0.02 x 0.07 = .0014.
Source:
Environmental Awareness: Knowing Your World: Energy and Ecosystems
"Competition Science Vision" Magazine; Environmental Biology; Kumar Pushkar; July 2006
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