P

peak production of oil, 30-31, 34.35

permaculture, 80,95-97,100101

pesticides: in Cuba, 58; early use of, 5; and health concerns, 18, 23,26; use of, in US, 22-23 Petroconsultants, 31 petroleum, see oil phosphorus, 70,116 photosynthesis, 3,4-5 Pimentel, David, 19-20,24,

40-41 Pimentel, Marcia, 24 Pittman, Scott, 95 pollution, 17-18,26-27,35 population explosion {see also depopulation): and global sustainability, 41-42; and the invention of agriculture, 4,5; in the US, 40, 41

positive feedback loops, 44, 46

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