AIM: How does pollution affect the environment?

wastes from homes & factories animal wastes from farms Water Pollution disposal of substances into water- lakes, rivers, oceans Sewage wastes from homes & factories animal wastes from farms fertilizers

Toxic Wastes Toxic (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 Magnification The 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? Recycle Landfill Incinerate (burn)

Air Pollution The 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 Acid Rain Makes them acidic

certain pollutants react with sunlight. Smog results when certain pollutants react with sunlight.

Global Warming What 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 gases Gases 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? Burning of fossil fuels Deforestation Cow flatulence (methane)

Less trees = less photosynthesis = more CO2 and less O2 How does Deforestation cause an increase in atmospheric carbon dioxide? Glucose H2O + O2 CO2 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?

This increase in earth’s temperature is called: 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)? Chemicals that destroy the ozone layer Aerosol cans Refrigerator Emissions Air Conditioner Emissions

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 More UV radiation Caused by air pollution Melting of Ice caps Mutations CFCs CO2