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Environmental Science
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Environment • Population: a root cause of environmental degradation. More is consumed that what is supposed to be. THE FIRST HUMANS? • How long has the Earth been around? - 5 billion • Humans? - 4 ~ 7 million. • First human - Lucy Doubling time: • #### Equation • Population growth doubles every 35 years ( in 2 months its 35 months) • At 1.2% how long does it take for the Earth’s population to double? 58 years. • In Canada, growth rate (natural and net immigration together) = 0.9% (now 33.5M) It will double in 75 years. • In China, the population growth was 2.8% (70 / 2.9 years = 24 years). • 1979, one child policy. This had a major growth rate was not that high. • Population growth need needed for population to decline? - Less then 0. • Given the negative growth rate what would be the doubling time? - IMPOSSIBLE Global Population Growth: • Population growth rate is exponential. (e.g. Bank rate - population is being compounded in the low rate- peak in the late 60). Carrying Capacity: • WIll come to an limit. The maximum population size of a species a given environment can sustain., predators, disease. • Resources are finite- limiting factor- water, space, food • We are able to live on Earth over the carrying capacity due tot he aid of the technology. • At carrying capacity, birth = deaths. • earth can only sustain 10 million people for a excellent lifestyle. Carrying capacity Uncertainty: • Isolated population - major drops. 4 distinct increase in Carrying Capacity for humans): • Cultural Evolution: Paleolithic • Neolithic • Industrial revolution • Modern- technological revolution - NOW • People have moved around and taken to different places. The movement lately is urban. Agricultural Revolution: • From Paleolithic period. • Could densify the population around the food farm. (working together to produce food). • Population was able to provide food/ nutrition more than required than previous year. • Started developing more societal frame work. • If you continue to Irrigate the soil- it will become salty. (in some areas the salt have increased- as a result many crack in the agriculture. Industrial revolution: • Transition from basic framing and manufacturing - massive fuel production. • even in the agricultural field- tractors. Medical- Technological Revolution • Green revolution- agricultural revolution- More food. Fertilizers, ge
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