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Billions of Tons of Green Stuff
What Earth Does for UsAnd What We Do to Earth
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Africa agriculture Amazon Amazon basin animals annual annual plant answer areas average billion tons biodiversity biomass birds boreal burned bycatch calculations calories canopy carbon catch century Chapter cleared coastal consume croplands crops dams decade deforestation desert desertification dolphins drier drylands eastern ecologists ecosystems endemics estimate extinct fires fish fisheries fraction freshwater global grasslands grazing lands green grow half harvest Hawai'i huge human impact humid forests irrigated islands less live livestock look mammals Manaus meter million km2 natural North America numbers nutrients Olson open oceans Pacific Pauly percent phytoplankton Pimm places plant growth plant production plantations population quickly rain rainforest range remain rivers runoff satellite images scientists soil South species square kilometer Stanford group surface taxonomists tion tons of biomass trees trillion trophic levels tropical forests tuna Vitousek whales wood zooplankton