Here are the errors and issues identified in the sentences:
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In the first sentence, the phrase "and, in an area where the impact would be lower" is awkwardly placed and may suggest a fragment. The comma before "in" is unnecessary and creates confusion.
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In the second sentence, "the town could just rebuild an old one" could be seen as repetitive since "old one" refers back to "an existing mall."
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In the third sentence, "helps saves" is incorrect; it should be "helps save" to match the grammatical structure.
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There is some redundancy in the phrase "the area the old mall will be in will likely have little to no trees to cut," which could be streamlined but is not a grammatical error.
Overall, the sentences contain awkward phrasing and could benefit from clearer structure, but these are the primary errors noted.