The Greenhouse Effect G.H.E. is naturally good (it warms Earth) Problem: Excess heat trapped near...
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Transcript of The Greenhouse Effect G.H.E. is naturally good (it warms Earth) Problem: Excess heat trapped near...
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The Greenhouse Effect• G.H.E. is naturally good
(it warms Earth)• Problem: Excess heat
trapped near the earth’s surface
• Fear: Climate patterns change, ice caps melt
• Main Cause: CO2 from burning of fossil fuels (coal, oil, natural gas)
• Solutions: Reduce use of fossil fuels, regrow trees, alternative energy sources
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What’s a Greenhouse?A Greenhouse is designed to trap heat so you can grow plants year round, even in cooler environments.
heat
heat
heat
heat
Some heat escapes the greenhouse, but enough is trapped to keep the inside warm
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Earth
heat
heat
heat
Some heat escapes into space
Some heat naturally trapped by Earth’s atmosphere
The Natural Greenhouse Effect is good!
The Atmosphere
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CO2, Methane, other greenhouse gases
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Earth
heat
heat
heatheat
heat
Excess CO2 in atmosphere
Less heat escapes into space
More heat trapped near Earth’s surface
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The Greenhouse Effect is naturally GOOD!
Mars: No Greenhouse Effect
Little heat is trapped by the thin CO2 atmosphere. High temperatures can be around 20⁰F.
Earth: Balanced Greenhouse Effect
Average global temperature is 57⁰F.
Venus: The Extreme Greenhouse Effect
Heat is trapped by the thick CO2 atmosphere. Temperatures reach 750⁰F.
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Ozone Layer Depletion• Ozone Function: Block
UV radiation from sun• Problems:
– CFCs thinning the ozone layer
• CFCs common to coolants and foam production
– More UV radiation reaches the surface
• Effects: Crop damage, skin cancers, Eye damage
• Solution: Reduce CFCs, regrow trees
UV
Ozone layer blocks UV radiation from the sunOzone layer
CFCs
UV
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Argh!!!!
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• Defined: Precipitation with a below normal pH
• Cause:– Pollution from burning
fossil fuels rises into the air
• Effect:– Waterways more acidic– Kills plant and animal life– Biomagnification: toxins
accumulate in living tissue higher up the food chain
• Solutions:– Reduce fossil fuel usage– Add buffer (base) to
waterways
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Biomagnification
Acid rain
Pesticide runoff
Fertilizer runoff
Mercury
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SO2
NO
NO
Nitric acid
Sulfuric acid
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The Smog and Ground-Level Ozone• Reason:
– Burning of fossil fuels & industry
• Problems:– Respiratory illness– Ozone gas is poisonous
• Causes:– Particulates rise into air
and react with sunlight to make air pollution
• Solutions:– Reduce use of fossil fuels– alternative energy sources– Plant trees
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When is ozone good vs. bad?
When Good
• When 10-30 miles up in the atmosphere
• It blocks UV radiation from the sun
• Life doesn’t exist in the stratosphere
When Bad
• When near the ground• Where life exists
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Deforestation• Defined: Clearing of
forested areas• Reasons:
– High demand for wood products
– Make area for farmland
• Problems:– Species extinction– Excess CO2 released– Desertification: wind/rain
carry soil away
• Solutions:– Recycle– Improved farming
techniques
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Non-native Species Introduction• Defined: Foreign organisms
are introduced to a new habitat• Reason:
– Pet industry, “free ride” organisms, pest control
• Effects:– Foreign species outcompete
native species– Food webs unbalanced– Decrease biodiversity– Economic damage
• Solutions:– Laws preventing foreign
goods into new countries– Introduce predators
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The Big Problem: Overpopulation• Over 6.7 billion people
• Many natural resources are nonrenewable
– Fossil fuels take millions of years to form
• More people means:
– 1) More forests removed
– 2) More resources consumed
– 3) More CO2 released
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Lessonsfrom
China
• Encourage smaller families by:– 1) Free education for life to one child family
– 2) Free birth control
– 3) Financial: Salary, Pension, Housing, Medical
• 1970s = 5.8 children Today = 1.8
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Kobe Kuiz1) CFCs are manmade chemical responsible for the destruction of
_________________.
2) Which gas is a main contributor to the greenhouse effect?
3) Crop damage and cancers are caused by an excess amount of which type of energy?
4) Name the big three fossil fuels.
5) Which planet has excess temperatures because of a thick CO2 atmosphere?
6) Desert-like land is created as a result of which problem?
7) Where is ozone gas harmful to life?
8) Where is ozone gas helpful to life?
9) Food webs become unbalanced as a result of the introduction of which type of organisms?
10) Even though there may be space for people, why do those who study the environment consider humans to be overpopulated?