how many fish can we take out of this lake to not jeopardize their population
89
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proven reserves
how much we could extract at current prices
90
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estimated reserves
how much we expect exists in the world
91
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potential reserves
how much we could extract if prices went up
92
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carrying capacity
max amt of resources we need to maintain pop
93
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malthusian view
problem: population bomb solution: population control carry capacity: fixed
94
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marxist view
problem: distribution of resources solution: redistribution carrying capacity: not fixed
95
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ultimate resource view
problem: current institutions solution: human ingenuity carrying capacity: not fixed
96
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5 roles of agriculture
1. intl trade: rise in last 20 yrs 2. employment: 1/3 of labour force 3. source of nat. revenue: 5% of GDP 4. livelihood, generates surplus 5. environment: 35% of land dedicated to ag
97
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subsistence farming
small scale, personal consumption, low inputs low yield
98
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cash-cropping
diverse scale, commercial + personal consumption, variable inputs + yield
99
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industrial
large scale, commercial consumption, high inputs high yield, capital intensive
100
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agricultural intensification
using same inputs to get higher yield: induced innovation