Discussion
Lead was removed from petrol because it
Answer: D
Correct answer: Is a neurotoxin harming children
Lead was removed from petrol because it is a neurotoxin, and children are the most vulnerable: exposure in early childhood produces irreversible loss of cognitive function with no identified threshold below which it is safe. Tetraethyl lead put it directly into urban air, and blood lead levels in city populations fell sharply once it was withdrawn.
Lead does not cause acid rain and is not a greenhouse gas. It does poison catalytic converters, which reinforced the case for removal, but the driver was the harm to health.
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