Chapter 6 and 10 - Class #25

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Published on 12 Nov 2011
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Class #25! ! Science & Society November. 4, 2011
Nets and Plastic Debris Endanger Marine Life
- Plastic dumped into the sea harms wildlife
- Sea Turtles mistake plastic bags for jellyfish
- Most plastic is non-biodegradable
- In US 60-80%of marine litter is plastic
- Drifts for decades
Chapter 10 - Climate Change
Climate Change
- The Earth’s climate system
- Human influences on the atmosphere and climate
- Methods of climate research
- Impacts of global climate change
- Ways we can respond to climate change
Our Dynamic Climate
- Climate influences everything around us
- The Fourth Assessment Report of the Intergovernmental Panel on Climate Change
(IPCC) made it clear that:
- Climate is changing, we are the cause, and this change is already exerting
impacts that will become increasingly severe
- Climate change is the fastest-moving area of environmental science today
What is Climate Change?
-Climate = an area’s long-term atmospheric conditions
- Temperature, moisture content wind, precipitation, etc.
- Weather = conditions at localized sites over hours or days
- Global Climate Change = describes trends and variations in Earth’s climate
-Global Warming = an increase in Earth’s average temperature
-Earth’s climate has varied naturally through time
-The rapid climatic changes taking place now are due to human activity: fossil
fuels, combustion, and deforestation
The Sun and Atmosphere Keep Earth Warm
-Three factors exert more influence on climate than all others:
-The Sun (supplies planet’s energy)
-The atmosphere (absorb 70% of incoming solar radiation)
-The oceans (shape climate by storing and transporting heat and moisture)
Greenhouse Gases Warm the Lower Atmosphere
-As Earth’s surface absorbs solar radiation, the surface increases in temperature and
emits infra-red radiation
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Document Summary

Plastic dumped into the sea harms wildlife. Sea turtles mistake plastic bags for jelly sh. In us 60-80%of marine litter is plastic. Human in uences on the atmosphere and climate. Ways we can respond to climate change. The fourth assessment report of the intergovernmental panel on climate change (ipcc) made it clear that: Climate is changing, we are the cause, and this change is already exerting impacts that will become increasingly severe. Climate change is the fastest-moving area of environmental science today. Climate = an area"s long-term atmospheric conditions. Weather = conditions at localized sites over hours or days. Global climate change = describes trends and variations in earth"s climate. Global warming = an increase in earth"s average temperature. Earth"s climate has varied naturally through time. The rapid climatic changes taking place now are due to human activity: fossil fuels, combustion, and deforestation. Three factors exert more in uence on climate than all others:

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