HUMAN POPULATION GROWTH & NATURAL RESOURCES

EARTH’S CARRYING CAPACITY Thomas Malthus’s

essay was about: He claimed that the

human population was growing faster than Earth’s resources could support.

EARTH’S CARRYING CAPACITY Drawing of Figure 16.1 World

Population:

EARTH’S CARRYING CAPACITY What are renewable resources?

Resources that cannot be used up or can replenish themselves over time.

Examples: wind, water, sunlight

EARTH’S CARRYING CAPACITY What are nonrenewable

resources? Resources that are used

faster than they form Examples: coal, oil, natural

gas

THE STORY OF EASTER ISLAND 1. Easter Island before people arrived

on the island.

THE STORY OF EASTER ISLAND 2. Islanders started building the Easter

Island Statues.

THE STORY OF EASTER ISLAND 3. Islanders cut down trees to make

boats and shelter.

THE STORY OF EASTER ISLAND 4. Lack of trees causes erosion of

nutrient rich soil. The soil washed into the ocean.

THE STORY OF EASTER ISLAND 5. Islanders run out of resources and

are forced to leave the island.

THE STORY OF EASTER ISLAND

6. Today Easter Island is covered with grass, no trees, and the famous Easter Island Statue heads.

THE STORY OF EASTER ISLAND

What is an ecological footprint? The amount of

land needed to produce and maintain enough food, water, shelter, energy, and water.

ECOLOGICAL FOOTPRINT EXTRA CREDIT http://www.footprintnetwork.org/en/ind

ex.php/gfn/page/calculators

THE STORY OF EASTER ISLAND Which continent has the largest human

population? Asia

THE STORY OF EASTER ISLAND Which continent has the largest

ecological footprint? North America

THE STORY OF EASTER ISLAND Which

continent has the most level (close to equal) population to ecological footprint? Central &

South America

THE STORY OF EASTER ISLAND What things can you personally do at

home and school that can help save resources? You answer!

THE STORY OF EASTER ISLAND Why is our ecological

footprint related to an area of land? Land is needed to

support a population because we need land to support a lifestyle (a place to live, work, land for agriculture, a place to put waste that supports this lifestyle)

AIR QUALITY – ACID RAINWhat causes this

problem?What ecological problems does it

cause in the environment?

What can people do to prevent or

stop this problem from

occurring?• Pollutants in the water cycle cause the pH of rain to drop.

• Lowers the pH or a lake or stream – affects organisms living there.• Can harm trees.

• Stricter laws on factory emissions.• Drive less.

AIR QUALITY – ACID RAIN

AIR QUALITY – OZONE DEPLETIONWhat causes this

problem?What ecological problems does it

cause in the environment?

What can people do to prevent or

stop this problem from

occurring?• Ozone absorbs UV light• CFC’s used in refrigerants, aerosol cans destroy the ozone layer.

• More harmful rays of UV exposure.• UV light causes cancer.

• Decrease use or production of CFC’s

AIR QUALITY – OZONE DEPLETION

AIR QUALITY – GLOBAL WARMING (GREENHOUSE EFFECT)What causes this

problem?What ecological problems does it

cause in the environment?

What can people do to prevent or

stop this problem from

occurring?• Water vapor, methane, carbon dioxide.• Greenhouse effect

• Climate change, loss of habitat.

• More strict regulations for production of greenhouse gases.

AIR QUALITY – GLOBAL WARMING (GREENHOUSE EFFECT)

WATER QUALITY – BIOLOGICAL MAGNIFICATION

What causes this problem?

What ecological problems does it cause

in the environment?

What can people do to

prevent or stop this problem

from occurring?• Pollutants that are water soluble and will stay in the body fat of an organism.

• Concentrations of a harmful substance accumulates to dangerous levels.

• Stop the use of DDT pesticide.

WATER QUALITY – BIOLOGICAL MAGNIFICATION

WATER QUALITY Explain how biological magnification

works using the picture:

WATER QUALITY What other water related problems do

we experience in Southern California?