AIM: What is Global Warming? Do Now: In your notes, discuss what you know about global warming. What causes it? Can it be stopped?

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Presentation transcript:

AIM: What is Global Warming? Do Now: In your notes, discuss what you know about global warming. What causes it? Can it be stopped?

I. Greenhouse Effect - causes the Earth to heat up by trapping insolation radiated from the sun and energy reradiated by the Earth. Insolation = incoming solar radiation (UV, infrared and visible light) Energy reradiated from Earth = infrared

- three major greenhouse gasses are carbon-dioxide (CO 2 ), methane and water vapor. - carbon dioxide is the best absorber of infrared energy.

- Insolation can be: Transmitted through the atmosphere and absorbed by the Earth. (reradiated as infrared) Absorbed by greenhouse gasses in the atmosphere before reaching Earth and after it is reradiated by Earth,

–As greenhouse gases increase, temperature increases. Source of methaneSource of co2 and water vapor

Greenhouse Gases: From Human Activity DO NOT COPY Cars and factories Cows, termites and decomposing garbage

A A R R Space A A = Absorbed R = Re-radiated

II. Causes of Global Warming (increase of greenhouse gasses) A) The burning of fossil fuels (coal, oil, & gas) releases CO2 into the air.

B)The destruction of forests stops trees from absorbing up CO 2 during photosynthesis.

C) The burning of wood releases more CO 2 into the air. (forest fires)

D) Cattle, termites, & rice fields release large amounts of Methane into the air.

III. Effects of Global Warming: (effects from greenhouse gasses) A) Shift in temp. and rainfall patterns.

B) Increased strength and number of major storms due to temperature extremes.

C)Melting of polar ice caps and flooding of coastal areas.