AIM: How does pollution affect the environment?

Do Now: Quiz

HW: Test Friday- ecology and human impact

Water Pollutiondisposal of substances into water- lakes,

rivers, oceans

•Sewage•wastes from homes & factories

•animal wastes from farms•fertilizers

Toxic WastesToxic (poisonous) wastes can cause

environmental problems because when they are disposed of they can collect in

the cells of organisms.

Mercury is a toxin that can be found in fish

Biological MagnificationThe concentration of toxic substances

(DDT) as you move through the food chain (plants are eaten by herbivores, which are

eaten by carnivores, etc…..) increases.

Thermal (Heat)Some power plants & industries use water to cool their machines. The warmed water is then released into a river or lake. Why is this a problem?

The warm water cannot hold as much oxygen as cold water and some species may

suffocate.

Solid Waste

A new increased demand for disposable

products has led to solid waste problems.

How can we dispose of solid waste?

1. Recycle

2. Landfill

3. Incinerate (burn)

Air PollutionThe burning of fossil fuels that were formed from the

remains of organisms millions of years ago

contribute to air pollution.

Acid Rain• Due to burning of

fossil fuels• SO2 (sulfuric Acid),

NO2 (Nitric Acid)• Rain mixes with gases

in air• Destruction of trees

and destruction of pond ecosystems

Makes them acidic

Smog

results whencertain pollutants react

with sunlight.

Global WarmingWhat is Carbon Dioxide

(CO2)?

• A greenhouse gas that is produced from burning fossil fuels

• It is also a product of cellular respiration (we breathe it out)

Greenhouse gasesGases that trap heat in the atmosphere

What are some other greenhouse gases?

CO2, methane, water vapor

Carbon Dioxide in the Atmosphere:

The amount of carbon dioxide in the atmosphere has been increasing.

How do we contribute to the increase of carbon dioxide in the

atmosphere?1)Burning of fossil fuels2)Deforestation3)Cow flatulence (methane)

How does Deforestation cause an increase in atmospheric

carbon dioxide?

+CO2

Glucose

O2

H2O

Increased CO2 in the atmosphere

Less trees = less photosynthesis = more CO2 and less O2

What does increased levels of carbon dioxide in the atmosphere

cause?

heat that would normally radiate back into space gets trapped.

This increase in earth’s temperature is called:

Global Warming

What are some of the detrimental effects of Global Warming?

Melting of the polar ice caps, leading to a rise in sea level and flooding in many

coastal areas.

Ozone Layer:

Protects us from UV radiation

What are chlorofluorocarbons (CFC’s)?

• Aerosol cans

•Refrigerator Emissions

• Air Conditioner Emissions

Chemicals that destroy the ozone

layer

What is the problem with using CFC’s?

•They create holes in the ozone layer around earth.

•This will allow increased UV radiation to reach the Earth

How can UV radiation affect living things?

•Mutations

•Cancer

Global Warming vs. Ozone Layer Depletion

Causedby air

pollution

Warming More UV radiation

Mutations

CFCs

Melting ofIce caps

CO2

Global Warming

OzoneLayer