0708 global
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a Difference
One Watt Making at a Time
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Introduction
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Earth’s Climate
• ly 70 of !resent
• "i#uid $ater !resent %&'( )illion years
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*istory
• "ife ( million years ago
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Sun
Solar
Energy
Solar
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Sun
RadiationCooling
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Sun
Earth’s Tem!erature
Solar
nergy RadiationCooling
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Sun
Earth’s Tem!erature
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+reenhouse Effect
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+ases
Nitrogen (N2)
Oxygen (O2)
Water (H2O)
Carbon Dioxide (CO2)
Methane (CH4)
Non-reenhou!e
a!e!
""#
reenhou!e
a!e!
$#
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The U.S. emits about 6.4 billion metrictons of greenhouse gases annually, 25%of the world’s total.
arbon dio!ide stays in theatmos"here for a""ro!imately#$$ years, methane lasts about
#2 years. ther greenhousegases last e&en longer.
's these gases continue to raise surface
tem"eratures, they trigger the release of e&engreater (uantities of carbon dio!ide and methanethat are currently tra""ed in fro)en 'rctic"ermafrost and tundra soils, further increasingtem"eratures.
*"otentially causing +runaway global warming.
6.4 billion metric tons2-yr
These greenhouse gases last along time*
arming begets more warming*
' feedbac/ mechanism ensues*
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World$ide Car)on Emissions
C a r b o
n ( $ % " &
e t r i ' t o n
! )
%
$2
4
*
+
,
$+% $,%% $,% $"%% $"% 2%%% ear
.i/uid 0uel1otal
a! 0uelSolid 0uel
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Small changes really add up
Replace your old refrigeratorwith a new Energy Star: Annual savings: $90; 700 pounds !"
Set your thermostat down a fewdegrees in the winterAnnual savings: $#%; #&00 pounds !"
'ash clothes in cold water onlyAnnual savings: $70; %00 pounds !"
(rive )*S+ #0 fewer miles per wee,
Annual savings: $-0; %"0 pounds !"
Reduce your gar.age .y #0/through greater recycling or reducedpac,agingAnnual savings:
#"00 pounds !"
aul, and weatherstrip around doorsand windowsAnnual savings: $-0; 1%0 pounds !"
* These are mid-range estimatesfrom published sources; yoursavings may vary