1. Human Effects on Environment
page 171

2. Deforestation
clearing and removing forests or trees to use land for non-forest uses
urban development
farms and ranches
use wood from trees for fuel

3. What is a Greenhouse Gas? (GHG)
A gas in the atmosphere that absorbs and emits energy (heat)
Cause the “greenhouse effect-” an increase in surface temperature.
CO2 (Carbon dioxide)
CH4 (methane)
N2O (Nitrous oxide)

4. Burning Fossil Fuels What creates Greenhouse Gases? Breathing! Cows…
drive cars, trains, planes, boats, etc.
heat our homes
create electricity
Breathing!
Cows…

5. Earth’s Atmosphere 78.09% Nitrogen 20.95% Oxygen 0.93% Argon
0.039% Carbon Dioxide

6. What if we didn’t have greenhouse gases?
Earth’s average temperature- currently 15ᵒC- would drop about 33ᵒC… we’d freeze!

7. What if greenhouse gases increase?
Venus’s atmosphere is about 96.5% CO2 and is approximately 462ᵒC

8. What if greenhouse gases increase?
Polar ice caps melt, sea level rises, rainfall patterns change, animals start to die

10. Global Warming
Not so much a debate of if it is real, but if humans are the cause…

11. Can we decrease greenhouse gases?
Plants! Plants do photosynthesis in which they convert water and CO2 into sugar and oxygen

12. But what we do instead…

20. Invasive Species Non-native species (don’t occur there naturally)
usually introduced/brought over by humans
dangerous to native species