Question 13·Hard·Rhetorical Synthesis
While researching a topic, a student has taken the following notes:
- Electric vehicles (EVs) powered by lithium-ion batteries produce zero tailpipe emissions.
- Producing lithium-ion batteries is energy-intensive and requires mining rare metals.
- Hydrogen fuel cell vehicles also produce zero tailpipe emissions, emitting only water vapor while operating.
- Producing hydrogen fuel can be energy-intensive and, when it relies on fossil fuels, generates significant carbon emissions.
- Using renewable energy sources can reduce the environmental impact of both battery manufacturing and hydrogen production.
The student wants to emphasize that although both technologies eliminate tailpipe emissions, their production processes can still have environmental consequences. Which choice most effectively uses relevant information from the notes to accomplish this goal?
For rhetorical synthesis questions, first restate the task in your own words so you know exactly what the sentence must say (for example, “show that they’re clean while driving but production can still pollute”). Then quickly scan the notes and mark only the pieces that relate directly to that goal; ignore extra details. When you read the choices, eliminate any that (1) contradict the notes, (2) leave out a required part of the goal, or (3) add claims not supported by the notes (such as saying something is “completely” environmentally friendly). Choose the option that best combines all the key ideas from the notes in a single, accurate sentence.
Hints
Clarify the main contrast you need
Underline the two parts of the student’s goal: (1) both technologies eliminate tailpipe emissions, and (2) their production still has environmental consequences. Any correct answer must include both ideas.
Use the notes to define “environmental consequences”
Look back at the notes: what environmental problems are mentioned for producing lithium-ion batteries and producing hydrogen fuel? Focus on energy use, mining, and carbon emissions.
Check for overstatements or missing pieces
Eliminate any answer that suggests these vehicles are completely harmless to the environment, and also eliminate any answer that talks only about production or only about renewables but doesn’t clearly mention the lack of tailpipe emissions.
Step-by-step Explanation
Restate the student’s goal in your own words
The question says the student wants to emphasize two ideas at the same time:
- Both electric vehicles (EVs) and hydrogen fuel cell vehicles eliminate tailpipe emissions when driving.
- Their production processes can still harm the environment.
So the best answer must contain both parts: something like “even though they’re clean while driving, making their power sources can still cause pollution.”
Pull out the most relevant notes
From the notes, focus on the information that connects to those two ideas:
- EVs: “produce zero tailpipe emissions” → clean while driving.
- Hydrogen fuel cell vehicles: “produce zero tailpipe emissions, emitting only water vapor” → also clean while driving.
- Producing lithium-ion batteries: “energy-intensive and requires mining rare metals” → environmental cost in production.
- Producing hydrogen fuel: “energy-intensive” and “can generate significant carbon emissions” when using fossil fuels.
- “Using renewable energy sources can reduce the environmental impact of both battery manufacturing and hydrogen production.”
These points show: no tailpipe emissions during use, but potentially high emissions and environmental impacts during production, unless renewables are used.
Match answer choices to the goal and notes
Now compare each answer to the goal and key notes:
- One choice says these vehicles are “completely environmentally friendly” because of what they emit while operating. That ignores the negative production impacts and overstates the benefits.
- Another choice only talks about problems with mining or carbon emissions in production, without clearly mentioning that both technologies have zero tailpipe emissions while driving.
- A third choice focuses mainly on renewable energy reducing emissions, but doesn’t clearly emphasize the contrast “even though they have no tailpipe emissions, production can still be harmful.”
- Only one choice clearly contrasts clean driving (no pollutants while being driven) with potentially carbon‑intensive manufacturing, and mentions that renewable energy can change that.
The answer we want is the one that contains that full contrast.
Identify the choice that best fits
The choice that does all of this is:
B) Although EVs and hydrogen fuel cell vehicles release no pollutants while being driven, manufacturing their power sources can be carbon-intensive unless renewable energy is used.
It directly states that they have no pollutants during driving (eliminate tailpipe emissions), but their power-source production can still generate carbon emissions, and it correctly adds that using renewable energy can reduce those impacts.