Download - BAESI – Global Warming
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BAESI – Global Warming
Carbon Footprint
Dr. Eugene Cordero
Department of Meteorology and Climate Science
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Obviously, one of the main issues related to climate change is the burning of fossil fuels
Thus, energy use, and the continuing demand for energy are central to the challenges of climate change.
Energy and Climate Change
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CA COCA CO22 Emissions (per Emissions (per person)person)
22,941 lbs CO2 per person Annual usage: Electricity Usage: 7,032 kWh Natural Gas Usage: 422 therms Vehicle Usage: 571 gallons per person.
http://www.pge.com/includes/docs/pdfs/about/environment/calculator/assumptions.pdf
Global Average: 8,750 lbs CO2 per person
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Greenhouse Gas Emissions
Agriculture ~ 20-25% of all emissions
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CO2 emissions per person
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1. What percentage of electricity generation comes from the burning of natural gas?
2. What percentage of transportation energy comes from natural gas burning?
3. What percentage of transportation energy use comes from coal?
4. If you buy an electric car, what is the mostly likely source of energy?
5. Where does most residential energy come from?
Questions
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Emissions of heat trapping gases
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Indirect emissions
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Embodied Energy
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Apple
1 Energy Unit100-250 Energy
Units
Photo credit: Terry NathanPhoto credit: Terry Nathan
Apple Ipod
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MacBook Air -2008 13-inch MacBook Pro 17-inch MacBook Pro 15-inch MackBook Pro MacBook-2008iMac (24 inch)-2008 iMac (20 inch)-2008 LED Cinema DisplayMac Pro Mac Min iPhone 3G iPhone 3GS iPod nano iPod touch iPod shuffle
Carbon Footprint of Apple products
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Role of Agriculture on Carbon Emissions
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Growing Food
U.N. Food and Agriculture Organization, 2004
Methane
14-18% of all emissions due to livestock
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Carbon Footprint of Food
€
Food Energy Efficiency ≡Input Fossil Energy
Calories
+
Animal related methane emissions
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Carbon Showdown
vs
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Emissions from Transportation Annual transportation (Annual transportation (USAUSA))
– 9,000 average passenger car miles 9,000 average passenger car miles
Toyota Prius
(50 mpg)
ChevroletCobalt
(28 mpg)
Ford F-Series(13 mpg)
US Dept. of Transportation
1.8 tons/yr
3.5 tons/yr 5.2 tons/yr
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Food: Three Diets High:
– 38% animal products– All red meat
Normal:– 28% animal products– Mix of red meat, poultry and fish
Low:
– 18% animal products
– Chicken instead of red meat
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Auto - Diet Comparison
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Carbon Showdown
vs
Don’t eat a hamburger in a hummer
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vs Vegan
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Auto - Diet Comparison
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Carbon Footprint of US Food
83%
5%4%
7%
Weber and Matthews 2008
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Burrito (Beef): 850 calories: $6.10
Burrito (Veggie): 830 calories: $5.75
CO2: 3.8 kg
CO2: 0.5 kg
CO2 per dollar: 636
CO2 per dollar: 94
Calories per dollar: 140
Calories per dollar: 145
Burrito
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Transport
Climate Solutions
FoodHousing
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We can’t change
what we don’t measure Ecological FootprintEcological Footprint
– Good surrogate for carbon footprint– Broad assessment (housing, transport, food)– Units of measure are acres of land– Component of footprint is land required to absorb
waste (such as CO2)
http://www.myfootprint.org/
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Ecological Footprints The amount of
ecologically productive land used by individuals, cities, countries, etc.
Production and use of goods and services involve land use: have ecological footprints
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Carbon Footprint
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Ecological Footprint
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Ecological Footprint Calculators
Myfootprint.org (We’ll use this one today) Footprintnetwork.org/calculator
Other related info:
www.thestoryofstuff.com (Very provocative video on consumption)
Sustainable energy without the hot air: (My favorite numbers book of the year!) http://www.withouthotair.com/
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Activity Pair into teams of twoPair into teams of two Jointly compute your ecological footprint (average Jointly compute your ecological footprint (average
your results)your results) Compare to average American and speculate why Compare to average American and speculate why
they are differentthey are different Develop a strategy for how you might reduce your Develop a strategy for how you might reduce your
footprint by 20% for a week. Use the calculator to footprint by 20% for a week. Use the calculator to guide your reductions.guide your reductions.
User: dilbert Pass: Dogbert7 User: dilbert Pass: Dogbert7 (log onto local (log onto local machine, not METR) machine, not METR)
http://www.myfootprint.org/