The Greenhouse Effect What is the greenhouse effect? Interaction between planet’s atmosphere, star’s light Results in heating of planet What causes the.

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MODULE #1: Climate Change & Global Warming

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Presentation transcript:

The Greenhouse Effect What is the greenhouse effect? Interaction between planet’s atmosphere, star’s light Results in heating of planet What causes the greenhouse effect? Surface absorbs high-energy light from Sun Surface releases lower-energy light (infrared) Infrared light absorbed, re-emitted by gases Increases gas’ energy; results in temperature increase

Water on Earth Factors for liquid water Distance from Sun (“Goldilocks Zone”) Greenhouse effect (requires atmosphere) Earth’s atmosphere 78% Nitrogen (N 2 ) 21% Oxygen (O 2 ) 1% trace gases Carbon dioxide (CO 2 ) Water vapor (H 2 O) And many others! Image obtained from:

Greenhouse Gases N 2, O 2, not good greenhouse gases Greenhouse gases efficient at absorbing infrared light Most important greenhouse gases in atmosphere: H 2 O CO 2 CH 4 (methane) Image obtained from:

Global Warming Gradual increase in global average temperature 1 ° C since 1900 Are human activities causing global warming? What other factors can affect global temperatures? Does global warming affect peoples’ lives?

Global Warming: Temperature Variation

Global Warming: What You Need To Know Video obtained from:

Water on Earth Factors for liquid water Distance from Sun (“Goldilocks Zone”) Greenhouse effect (requires atmosphere) Earth’s atmosphere 78% Nitrogen (N 2 ) 21% Oxygen (O 2 ) 1% trace gases CO 2 H 2 O And many others!

The Greenhouse Effect What is the greenhouse effect Interaction between planet’s atmosphere, star’s light Results in heating of planet What causes the greenhouse effect? Surface absorbs high-energy light from Sun Surface releases lower-energy light (infrared) Infrared light absorbed, re-emitted by gases Increases gas’ energy; results in temperature increase

Water on Earth Factors for liquid water Distance from Sun (“Goldilocks Zone”) Greenhouse effect (requires atmosphere) Earth’s atmosphere 78% Nitrogen (N 2 ) 21% Oxygen (O 2 ) 1% trace gases CO 2 H 2 O And many others!