Exchange between Space and Biota

We assume that plants use only the solar short-wave radiation, absorbed by the Earth's surface, 160 Wm-2. Since plants absorb only 53.5% of this energy (photosynthetically active radiation), 85.6 Wm- , and vegetation covers 72.5% of land area, Aveg « 1.1 x 1014m2, the biota gets annually

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