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  • because: demographic explosion
    • because: nature of human population
      • because: response of population
        • because: the case of hunter-gathers
        • because: Neolithic Revolution
      • because: variation of human population
        • but: it doesn't hold for 1st world
    • but: dietary change as a solution
      • because: more use of soybeans
        • because: meat production is less efficient than plant produ...
        • because: lower in food chain
        • because: problem of meat production
          • but: meat producers cut energy consumption as much as possible...
      • because: vegetarian good for health
      • but: unrealistic
        • because: people won't give meat up
          • but: reduce intake of meat, not give it up totally
      • because: meat production reduces crop production
    • but: Hardin was writing over a decade ago, but the situation...
    • but: advancement of technology raises food production
      • because: utilizing wasteland
        • because: aquaculture
      • because: use new species for food
        • because: high adapitility
    • but: decreasing population growth
      • because: increasing birth control
        • because: sub-replacement fertility
        • because: 1950s baby boom is unusual
          • because: population drop in 1st world
            • because: decrease of family sizes
              • because: demographic transition
                • because: later ages of marriage
                  • because: changing of women's minds
                  • because: enjoy more freedom
                  • because: decrease need of children
                    • because: economic liability of children
                      • because: status of children's changed
                        • but: the work of children in industrialised countries after...
    • because: decreasing food production
      • but: food production per person inc
      • but: improved agricultural techniques make the remaining...
      • because: decreasing arable land
        • because: desertification
        • because: global warming
          • but: crops move north
    • because: shortage of fossil fuels
      • but: replacement technologies
        • because: examples
    • because: exponential demographic growth
      • but: population also falls at an exponential rate
      • but: the case of US
      • because: growth of population is a GP
        • because: Malthus's claim
          • because: Malthus's second postulatum
          • because: Malthus's first postulatum
    • but: contrary to the global trend
      • but: only temporary sustainable
        • because: external impact
  • because: equilibrium already exceeded
    • because: carrying capacity of the earth
      • but: technology increases the carrying capacity of land
        • but: tech. increases carrying capacity insufficiently
    • because: terriorist attacks
      • because: famine
        • because: the case of South Asia
        • because: the case of China
      • but: %age of world population killed in war going down
    • but: global poverty is declining
      • because: supporting data
    • because: infant mortality in 3rd world
    • because: 850m people are starving
    • because: 1.1b people of water shortage
Our world is now under the threat of over-population
  • but: world still has huge area with few or no people
    • but: the wilderness is unsuitable for humans to live in
      • but: global warming so taiga and tundra more habitable
        • but: global warming will make the deserts grow
          • but: there is more taiga and tundra than desert
  • but: not all countries are over-populated
    • but: over-population is a global issue
      • because: over-population causes global warming
        • but: global warming from non-over-populated countries
  • because: over-population causes over-use of world resources
    • but: Crisis caused by consumption by the rich, not poor