footprint 1 ha=2.47 ACRE * 8 almost 20. Scientific American 2006: US 9.7, not 8.0?
Ecological Footprint Calculator from Global Footprint Network
Global ecological footprints Scientific American, March 06
Footprint Calculator
biocapacity provide resources/manage wastes
footprints U.S. 300 mill/2007. Earth 7B people x 24=168B acres, Earth 57M sq.mi=36B acres land
impact Gecko adhesive NOVA David Pogue Making Stuff Smarter
cost Internal: also tax, insurance, profit; paper $5/ream(500)=1 cent
triple-bottom-line: economic, env, social costs
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