BIOL 2Q04 Lecture Notes - Lecture 20: Water Purification, Healthy Planet, Exponential Growth
14 Dec 2016
School
Department
Course
Professor
BIOL 2Q04 | November 30, 2016
From Population Growth and Sustainability to Healthy Planet
Outline
− Human populations
− Sustainable Development
− Sustainability
− Conservation
o Diversity
o Actions and solutions
o Restoration
Human Ecology
− Studies interactions between humans and the environment
o How do we affect the environment and vice versa?
− Main issue: population growth
o Increasing at a fast rate
▪ Right now: > 7 277 083 300 people
▪ 2 6000 000 000 are in China and India
• Remember that high density population = difficult to survive
− Figure 26-1
o Exponential growth
▪ About 6% of the humans who have ever lived are alive right now
− Figure 26-3
o Decrease in population in 2000 to 2005
o 2.1 children per female → decrease between 2000 and 2005 is still over 2.1 thus the
constant increase in population
o In China, they decreased population by implementing a 1 child per person law
▪ Will change and cause an increase in population because they are allowing 2
children per couple
Carrying Capacity of the Earth
− Huge question: Are we there yet?
− What is the K of the human population?
o Around 10.1 billion
▪ Lak of food, lak of ater…
Sustainable Development
− Meeting the needs of today without compromising the needs of future generations
− Ensure that access to resources is available for present and future generations
o We have limited resources because it is not infinite
o Paul Ehrlich was the first to determine:
▪ Population + Growth + Advances in Technology (P + C + T) pushes the threshold
a little faster than expected
− Economic development and population growth = pressure
find more resources at oneclass.com
find more resources at oneclass.com
− All species need:
o Water
o Food
o Shelter
− In addition, for human:
o Education
o Health Care
Ecosystem Services
− Ecosystems are composed of essential elements for the survival of all organisms, and their
ability to function
o I.e. Water that is present now, but will not survive any longer, therefore is not
functional
− Not only for human services
− Table 1 (Red are for all other species, all listed are required for humans)
o Oxygen and air purification
o Food
o Fiber
o Nutrient balance
o Water purification
o Climate control
o Soil production
o Religious expressions
o Psychological and spiritual development
Goods and Services
− Goods: food, water, fiber
− Services:
o Provisioning services
▪ Food, fiber, timber, fuel production
▪ Water supply
▪ Genetic diversity
• More genetic variability in crop = better resistance to insect and pest =
more production
o Regulating services
▪ Diseases, pests, flood control
▪ Climate regulation
▪ Water purification
o Cultural service
▪ Recreation
▪ Education
▪ Spirituality
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
From population growth and sustainability to healthy planet. Conservation: diversity, actions and solutions, restoration. Increasing at a fast rate: right now: > 7 277 083 300 people, 2 6000 000 000 are in china and india, remember that high density population = difficult to survive. Figure 26-1: exponential growth, about 6% of the humans who have ever lived are alive right now. Figure 26-3: decrease in population in 2000 to 2005, 2. 1 children per female decrease between 2000 and 2005 is still over 2. 1 thus the constant increase in population. In china, they decreased population by implementing a 1 child per person law: will change and cause an increase in population because they are allowing 2 children per couple. What is the k of the human population: around 10. 1 billion. Meeting the needs of today without compromising the needs of future generations. Economic development and population growth = pressure a little faster than expected. All species need: water, food, shelter.
