Sinnott-Armstrong points out that greenhouse gases are perfectly fine in small quantities- the problem emerges only when there is too much of them. Which principle does this undermine as a basis for the wrongness of driving unnecessarily?

Question

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The harm principle states that it is wrong to cause harm to others through one's actions. However, Sinnott-Armstrong's argument shows that the harm caused by greenhouse gases only emerges when there is too much of them, and therefore, small quantities are not harmful. This undermines the harm principle as a basis for the wrongness of driving unnecessarily.

Sinnott-Armstrong Points Out That Greenhouse Gases Are Perfectly Fine in Small