PPT Lecture: Global

Warming

Slide 2 - Greenhouse EffectThe process of the atmosphere trapping heat from the sun.

Without the atmosphere, heat would float off into outer space.Earth would be about 30°F each day without an atmosphere.

Slide 3 - Other PlanetsAny planet with an atmosphere,

experiences the greenhouse effect.

Slide 4 - Earth’s Atmosphere

78% Nitrogen

20% Oxygen

2% Other (CO2 for example)

Slide 5 - Venus’s Atmosphere

96% CO2

3% Nitrogen

1% Other

Slide 6 - Greenhouse GasesThe only gases in the atmosphere that have the

ability to trap heat from the sun.Both natural and unnatural (human made) gases!

Slide 7 - Natural Greenhouse Gases

Water Vapor

CO2

Methane (CH4)

Nitrous Oxide

Slide 8 - Human Made Greenhouse Gases

Hydrofluorocarbons (HFCs)

Perfluorocarbons (PFCs)

Sulfur Hexofloride (SF6)

Slide 9 - Human ActivitiesAdd significantly to the amount of

greenhouse gases in the atmosphere!

Slide 10 - CO2Burning of fossil fuels (combustion) releases more

CO2 in the atmosphere than would be present naturally.

Slide 11 - Transportation and ElectricityMain reasons why CO2 is released in the

atmosphere!

Slide 12 - Methane CH4Gas released from animals. It’s also a

greenhouse gas and causes Earth to heat up

Slide 13 - FarmingThe more animals we raise for food, the more

methane released into the atmosphere.Pigs and cows release methane!

Slide 14 - MethaneChickens release methane!

Slide 15 - Deforestation (killing trees)

Plants take in CO2 and convert it into O2 during photosynthesis.

Less trees, more CO2 left in the atmosphere!

Slide 16 - PollutantsAnything that harms the

environment! Excess CO2 from burning fossil fuels.

Ozone Layer in stratosphere is destroyed from the release of CFCs caused by industry.

Slide 17 - Ozone Hole Developing

South Pole

Slide 18 - Global WarmingBoost in the greenhouse effect due to more

greenhouse gases in atmosphere from human activities leading to warmer global temperatures.

Slide 19 - Global Warming Impacts

Increase evaporation

Ice at poles to melt

Slide 20 - Sea-Level Changes - FloodingApprox. 50% of the world’s population

lives near coastlines, which may be under water in the future!

Slide 21 - What can you do?

Turning off lights when not in use.

Turning down heat in winter.

Reduce air conditioner use in summer

Recycling! Less energy is used to recycle than make from scratch.

Use public transportation or drive fuel efficient cars.

Slide 22 - VenusSince it has a lot of CO2, it has a stronger

greenhouse effect than Earth. The plant is about 860 Degrees

Fahrenheit.