Exam (elaborations)
BBE 2201 Final Questions and Answers 2024
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Exam of 9 pages for the course BBE at BBE (BBE 2201 Final)
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BBE 2201 FinalSlow Carbon Cycle - answer Carbon moving through rocks, soil, the ocean, and the atmosphere over time
Fast Carbon Cycle - answer Carbon moving through life forms, i.e plants and animals
True/False: Clearing forests to plant agricultural crops results in an increase in atmospheric carbon dioxide - answer True. There is a carbon equilibrium established with any land use.
Where are the 9 gigatons of added carbon (by humans) in the fast carbon cycle going? -
answer Two = taken up by oceans
Four = into the atmosphere
Three = plants, soils & other biomass
Algae and other plants play this role in the Carbon Cycle: - answer Carbon Sink
Term that describes how carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere and the atmosphere of Earth: - answer The Carbon Cycle
Term that describes the amount of carbon dioxide, or equivalent greenhouse gas, caused by a person, organization, event or product: - answer Carbon Footprint
Term for Carbon created by human activity: - answer Anthropogenic Carbon
Of these three fossil fuels (natural gas, coal, petroleum), which contributes the LEAST to U.S carbon emissions? - answer Coal
Of the four sectors for carbon dioxide emissions contributors in the U.S (commercial, transportation, industrial, residential), which is the largest? - answer Transportation
Carbon dioxide accounts for ____% of U.S global warming potential - answer82%
An LCA (Life Cycle Assessment) provides: - answer Information to assess the environmental impact of a product of service.
Four potential users of LCAs: - answer Product Designers
Consumers
Academics Marketers
Normalization in an LCA does what? - answer Helps put the results in perspective in order to compare with other impacts.
List the 5 stages of the LCA process map: - answer1. Material Extraction
2. Manufacturing the product
3. Packaging and Transportation (distribution)
4. Use
5. End of Life
It is estimated that there are about 20 lbs of CO2e per gallon of milk. In contrast, Coke has a carbon footprint of about 250 g CO2e/liter (purchased in 2 liter plastic bottles). What is milk's carbon footprint in g CO2e/liter? - answer The conversion: 20 lbs/gal x 1 gal/3.78 liters x 453 grams/lb ~~ 2110 grams/liter
= 2400 grams CO2e/liter
Two primary ways that humans impact the earth's energy balance: - answer1. Land use changes that impact average reflection/absorption
2. Increased GHG emissions
What is about 15 degrees celsius? - answer The average global temperature
About how much of the sun's energy is absorbed by the earth overall? - answer About 71%
Four things that impact the earth's energy balance, causing changes in climate: - answer1. Concentration of GHG
2. Reflection of the earth's surfaces
3. Earth's distance from the sun
4. The sun's energy output
About how much of the sun's energy is absorbed by the land? - answer About 48%
How does water vapor contribute to negative feedback? - answer Increasing water vapor in the atmosphere results in more clouds which reflect more of the sun's energy, thus reducing global temperatures
How is water vapor seen as positive feedback? - answer Increasing global temperatures
by trapping heat
Why is water vapor the most prevalent GHG? - answer It absorbs infrared radiation
What are the two ways changes in land use impact climate change? - answer1. Energy reflection or absorption
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