Question 11 pts

The article Powerful 'mechanical trees' can remove CO2 from air to combat global warming at scale (Links to an external site.)

highlights research at ASU. The proposed full-scale CO2 farms will each be capable of removing 3.8 million metric tons of CO2 annually. How much of the 51 billion tons are we talking about? (Note that Gates is using units of metric tons.)

Group of answer choices

0.0075%

7.45%

0.0013%

0.13%

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Question 22 pts

Find an existing or proposed project that reduces/will reduce CO2 emissions. Describe what the project is, and calculate what percent of the 51 billion tons per year is the project. Include website link for the project you find.

Answer:

Flag question: Question 3

Question 31 pts

What percent of global greenhouse gas emissions can be attributed to the category of "making things (cement, steel, plastic)?

Group of answer choices

31%

27%

19%

16%

Flag question: Question 4

Question 41 pts

The Palo Verde Nuclear Plant can produce 4,000 MW of power. Using Gates's rule of thumb, how many average American houses could be powered by the nuclear plant?

Group of answer choices

4,000

40,000

4 million

0.25 million

Flag question: Question 5

Question 51 pts

The Kayenta Solar Facility (Links to an external site.) in Navajo Nation produces 27.3 MW. Assuming the highest watts per square meter in the range provided by Gates, what area (in acres) would you expect is required for the solar facility?

Group of answer choices

5,460 acres

5.46 acres

337 acres

0.53 acres

Flag question: Question 6

Question 61 pts

Explain what a Green Premium is.

Answer:

Flag question: Question 7

Question 71 pts

The "questions to ask" about climate change technologies include:

Group of answer choices

How much land area will the technology use?

What is the Green Premium for this technology?

What is the plan for cement (and other products used in "making things")

What percentage of annual global greenhouse gas emissions is the technology?

How much power are we talking about?

pur-new-sol

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