1. How do humans impact the environment?
1. Population growth
More people means
more resources are used
and more pollution
& garbage
2. Pollution
Industrialization: factories
Burning of fossil fuels (gas/oil) for factories and cars
Increased carbon dioxide levels in atmosphere

2. Limited/Finite Resources (have a certain amount of them)
Renewable Resources- can be replaced with time
Examples: food supply, solar energy, wind energy
Nonrenewable Resources- cannot be replaced once they are used
Examples: fossil fuels (gas, oil, coal), minerals

3. Acid Rain Result of air pollution
Burning of fossil fuels releases pollutants into the air
Pollutants mix with rain water and then collect in ponds/streams/lakes/ground
Decreases biodiversity because some organisms can no longer live in the water
Changes/affects food chains/webs

4. Acid Rain

5. Global Warming
Caused by the Greenhouse Effect: increase in carbon dioxide in atmosphere, causes temperature of Earth to rise.
Main greenhouse gas: carbon dioxide
Effects: melting of polar ice caps, increase in extreme weather
Why would deforestation make this worse?

6. Global Warming

7. Global Warming

8. What activities produce greenhouse gases?
Agriculture: (releases methane)
Transportation (cars, trucks, buses…): burns fossil fuels
Burning fossil fuels: factories, cars
NOT BREATHING!!!!!!

9. Global Warming

10. Global Warming

11. Ways to reduce pollution and production of greenhouse gases?
Car pool
Electric cars
Public transportation
Plant new trees
Recycle
Wind/solar power
Reduce buring of fossil fuel/ gas, and less carbon dioxide released into environment

12. Use of Herbicides/Pesticides
Can kill other organisms than the ones intended
Can cause pesticide/herbicide resistance
Mutations allow some organisms to survive spraying
They reproduce and produce offspring that are also resistant
Have to find other ways to kill pest… sometimes a natural predator

13. Why would deforestation make global warming worse?
Trees/plants remove carbon dioxide from the environment to use for photosynthesis
If forests are cut down, then less trees/plants to remove carbon dioxide from the environment
Cutting down trees/forests
Use materials, build/farm on the land
Decreases biodiversity (number of living species in an area like a forest)

14. Biomagnification
Increase in the concentration of a substance (toxic/poison) in living organisms as you move up the food chain.
(Toxins dumped in water, get eaten or absorbed by organisms)

15. One more thing: invasive species
Organisms that are brought to an area, not native to that area originally
Why is this bad?
Invasive or non-native(exotic) species compete with native organisms for resources
Prey (kill/eat) native organisms = decrease biodiversity
Change food webs/chains

16. Examples of Invasive/non-native/exotic Species
purple loosestrife plants: out-compete other plants for food, decreases biodiversity of area
zebra mussels in Lake Erie: out-compete other organisms for food, clog pipes, cling to ships
stink bugs: invade homes, no natural predator
Dutch elm disease: brought over by beetles, has killed half the elm trees in the US = decrease biodiversity.