文档介绍：Global Warming
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Background
Reason
Problem
Solution
目录
CONTENT
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The  climate has been gettiGlobal Warming
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Background
Reason
Problem
Solution
目录
CONTENT
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The  climate has been getting steadily warmer and warmer in recent years.
Background
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The average global temperature  rises significantly after entering the eighties
Global warming is coming !!!!
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There are many reasons of the global warming, but it mainly caused by human activities
Reason
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Initial causes of temperature changes
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Aerosols and soot
Greenhouse gases
Variations in Earth's orbit
Solar activity
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Fossil fuel burning
land-use change
Population growth
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Greenhouse gases
CO2
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In addition to their direct effect by scattering and absorbing solar radiation, aerosols have indirect effects on the Earth's radiation budget.
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Aerosols and soot
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Solar activity
The sun ’activities cause volcanic eruption , and produce a large number of ash
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Variations in Earth's orbit
Variations in orbital cycles may initiate a new glacial period in the future, though the timing of this depends on greenhouse gas concentrations as well as the orbital forcing.
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Global warming causes all sorts of problems
Problem
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Extreme weather
Sea level rise
Long-term effects
Ecological systems
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Extreme
weather
Projections suggest a probable increase in the frequency and severity of some extreme weather events, such as heat waves， Elnino（厄尔尼诺）, drought, floods, thunderstorms, hail（冰雹）, storm, the heat and dust storms
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Sea
Level
Rise
19th century ——rise at the rate of to per one hundred meters
Ice, islands, city disappear
Bring disaster to the coastal areas
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Terrestrial（陆地） ecosystems
threaten coral reefs, fisheries, protected species, and other natural resources of value to society
Effect the flight o