Being mindful: Your Carbon Footprint...CO 2 is the carbon footprint due only to the greenhouse gas...
Transcript of Being mindful: Your Carbon Footprint...CO 2 is the carbon footprint due only to the greenhouse gas...
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Being mindful: Your
Carbon Footprint
Professor Cathy MiddlecampNelson Institute for Environmental StudiesUniversity of Wisconsin-Madison
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What do you already know about carbon footprints?
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What is the difference between expressing carbon footprints as CO2 and CO2e?
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CO2 is the carbon footprint due only to the greenhouse gas CO2.
CO2e includes the impact of allgreenhouse gases, not just CO2.
What is the difference between expressing carbon footprints as CO2 and CO2e?
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Greenhouse Gases
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2012 U.S. greenhouse gas emissions totaled 6,526 million metric tons of CO2e.
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2013 U.S. greenhouse gas emissions totaled
6,673 million metric tons of CO2e.
]
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2014 U.S. greenhouse gas emissions totaled
6,870 million metric tons of CO2e.
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Questions …?
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Carbon footprint
A shorthand
A metaphor
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• A mug of hot black coffee
• A diaper (reusable, line-dried)
• Sending a text
• A plastic bag from a supermarket
Rank these four items by their
carbon footprint
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• Sending a text 0.014 g
• A plastic bag from a supermarket 10 g
• A mug of hot black coffee 23 g
• A disposable diaper 145 g
Rank these four items by their
carbon footprint
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• Bottled water, 16 oz.
• Strawberries, pint basket
How about these two items?
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Under 10 grams
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10 grams to 1 kilo
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10 tons to 100 tons
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Questions …?
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p. 21
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Perspective“A friend recently asked me how he should best dry his hands to reduce his carbon footprint, …
The same person flies across the Atlantic literally dozens of times a year. A sense of scale is required here, …
I want to help you get a feel for roughly how much carbon is at stake when you make simple choices – where you travel, how you get there, whether to buy something, whether to leave the TV on standby, and so on.”
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1. Light bulbs2. Hot water3. Food4. Clothing
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1. Light bulbs
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Page 102
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Page 102
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2. Hot water
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Page 17
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What if we heated the water
to a boil…?
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The carbon footprint for a cup of boiling water is about:
0.12 g CO2e (~ 2x tap water)
1.2 g CO2e (~ 20x tap water)
12 g CO2e (~ 200x tap water)
120 g CO2e (~ 2,000x tap water)
A
B
C
D
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The carbon footprint for a cup of boiling water is about:
0.12 g CO2e (~ 2x tap water)
1.2 g CO2e (~ 20x tap water)
12 g CO2e (~ 200x tap water)
120 g CO2e (~ 2,000x tap water)
A
B
C
D
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39Page 84
Hot water in a bathtub (or shower)
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3. Food!
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Choose the lower carbon meal choice.
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Choose the lower carbon meal choice.
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Choose the lower carbon meal choice.
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Choose the lower carbon meal choice.
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Ruminant animals
http://www.epa.gov/climatechange/pdfs/usinventoryreport/US-GHG-Inventory-2015-Chapter-5-Agriculture.pdf
cattle
buffalo
sheep
goats
Ruminant animals have the highest CH4 emissions per unit of body mass of all animal types.
camel
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“Food from animals turns out to be more carbon intensive (remember, this is my shorthand for greenhouse gas intensive) than food from plants, simply because animals are inefficient devices for producing food. They eat plants and then spend their lives wasting most of the energy from them on things such as walking around and keeping warm.”
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“Beef and lamb are doubly high in carbon because they are belching ruminants. Chicken is a bit better because, to put it bluntly, they don’t live as long, so they don’t get so much opportunity to waste the energy in their feed. Dairy has all the same problems of ruminant meat production, so there is little point in switching from beef to cheese.”
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Choose the lower carbon meal choice.
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Choose the lower carbon meal choice.
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Choose the lower carbon meal choice.
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Choose the lower carbon meal choice.
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72% on the farm!
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“Wherever you get your milk; however, it remains – like all food from cattle – a high-carbon way to get your calories.”
Page 72
The point:
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4. Clothing
Cotton jeans
Nylon trail pants
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4. Clothing
Cotton jeans
Nylon trail pants
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Which one has a higher carbon footprint:
Cotton jeans
Nylon trail pants
A
B
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Which one has a higher carbon footprint:
Cotton jeans
Nylon trail pants
A
B
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Cotton jeans
Nylon trail pants
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The footprint of washing and drying the pants is likely to be several times that of producing them in the first place.
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Figure 5.5 The annual carbon footprint of buying and washing clothes.
ClothesWashingDrying
Cotton clothing, worn into the ground. Washed and tumble dried
Quick-drying built-to-last clothing. Worn into the ground. No tumble drying
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Cotton jeans
Nylon trail pants
Thank you!
Bruce and Cathy
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