• 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
• #### 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? -
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).
• 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
• 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
• 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
• Population was able to provide food/ nutrition more than required than previous
• 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.
• 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