Logical ReasoningDifficulty: Easy

PT143 S1 Q5 Explanation

Environment minister: Because of

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsWeaken

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Stimulus

Environment minister: Because of our concern about global warming, this country has committed itself to reducing its emissions of carbon dioxide substantially over the next ten years. Since trees absorb carbon will help us fulfill our commitment.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
5.

Which one of the following, if true, would most weaken the environment

Answer choices

  1. No Impact0% picked this

    Owners of large tracts of private land are usually unwilling to plant trees unless they are given a

    Did the Plan involve private citizens planting trees? It sounded like it was government action that was going to plant trees. So who cares about owners of private land? We might try to use this answer to object to the Plan by saying, "If you don't give private landowners money, they won't plant trees." But the author could easily respond, "Cool, we'll give them some money" or "Cool, we don't need them. We're going to plant trees on public land that we control."

  2. Irrelevant Comparison1% picked this

    Over the last ten years the proportion of land that is deforested annually has not increased as much as has the proportion

    Comparing the % increase of deforested land to the % increase in CO2 is totally irrelevant. The author was never assuming that those two percentages should be keeping track with each other. She is only assuming that if we, going forward, increase the percentage of forested land (i.e. plant some trees) we will decrease the proportion of CO2. This answer doesn't give us any way to call that into question.

  3. Correct93% picked this

    When ground is disturbed in the course of planting trees, more carbon dioxide is released into the atmosphere by rotting organic matter in the

    Why this is right

    This choice presents a scenario where the process of planting trees releases more CO2 than the trees will absorb in the next 10 years. This fundamentally challenges the argument by suggesting that tree planting could have a net negative effect on CO2 reduction, directly opposing the conclusion.

    Skill tested: Weaken · how this choice captures the argument's function is the move to repeat next time.

  4. No Impact0% picked this

    Many climate researchers believe that global warming is such an urgent problem that carbon dioxide emissions should be substantially reduced

    This doesn't talk about planting trees at all, so it doesn't give us any way to say the Plan won't achieve the Goal. It seems to just be saying many people think we should have a more ambitious Goal, but that has nothing to do with our task.

  5. No Impact (other gases)5% picked this

    Gases other than carbon dioxide contribute to global warming, and trees do not absorb any

    This mention of other gases aside from CO2 is beyond the scope, as the focus is solely on CO2 emissions.

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