1. Human Impact on the Environment
Human activities can affect the quality and supply of renewable resources such as land, forests, fisheries, air, and freshwater.

2. Sustainable Development
Sustainable development is a way of using natural resources:
without depleting them (using them up)
to provide for human needs without causing long-term environmental harm

3. Challenges
A major challenge of sustainable development is balancing the protection of ecosystems with the protection of human economic systems.

4. Sustainability
Sustainable = can happen for a long time without running out and without problems

5. Example: Wind Energy
The wind carries energy, and turbines (like windmills) can capture it, so that we can turn it into electricity and power.
The wind will never run out and wind power does not pollute the environment.
Wind power is expensive so it only provides 0.1% of our power.

6. Not Sustainable
Not sustainable = will run out or cause problems to use

7. Example: Burning Fossil Fuels
Fossil fuels = oil, coal and natural gas
85% of our energy comes from burning fossil fuels
We only have a certain amount of fossil fuels so we will run out
Burning fossil fuels pollutes our environment and causes global warming

8. Acid Rain Acid rain is caused by burning fossil fuels.
air pollutants mix with rain, making it acidic
acid rain can build up in lakes, streams and ponds and can kill off wildlife, like fish

9. Acid Rain
The scale to measure acidity ranges from 1 to 14, where a lower pH is acidic, and a higher pH is alkaline; a neutral pH is 7.

10. Deforestation de = down, away forest = trees
Deforestation = cutting down trees
Deforestation can have many negative impacts

11. Deforestation Deforestation can exacerbate climate change.
trees do photosynthesis to remove carbon dioxide from the atmosphere
when we cut down trees, there is more carbon dioxide and climate change is worse

12. Deforestation  Habitat Destruction
Trees give homes (habitats) to animals. When we cut them down, the animals lose their homes and die.
animals can become extinct if their habitat is taken away

13. Impact of Deforestation
If the grass was taken away, what would happen to the deer population? What would happen to the mountain lions?

14. Impact of Deforestation
If the grass was taken away, what would happen to the amount of carbon dioxide in the atmosphere?

15. How do you think human actions might reduce biodiversity?
bio = life diversity = different kinds
Biodiversity = different kinds of life (number of different species)
When human actions cause species to die we lose biodiversity.
How do you think human actions might reduce biodiversity?

16. Invasive (Non-Native) Species
Non-native = doesn’t normally live in an area
non-native species have no predators, so their populations will keep increasing
when we introduce non-native species, they can take over an ecosystem and kill the other species

17. Bioaccumulation Pesticides are substances that kill insects.
pest = something annoying (like an insect)
-icide = kill
Example: DDT

18. Bioaccumulation Pesticides can be absorbed into organisms’ bodies.
Pesticides are passed on when organisms eat each other.
bio = life
accumulate = build up
bioaccumulation = pesticides build up in organisms’ bodies
the most pesticide accumulates in the highest trophic levels