Yes, this rebuttal is directly responsive.  We could interpret Harry's response as follows:
 

P1.  We should not impose regulations that thwart economic prosperity even when such regulations would prevent environmental devestation.

P2.  Imposing regulation on salmon farming would thwart economic prosperity.

C.   We should not impose regulations on salmon farming.

Sally begins by recognizing that the two parties will not likely make progress (that is, come to any sort of agreement) with respect to the reasonableness of premise 1.  However, she cites unbiased scientific studies that challenge the truth of premise 2.
 
 
 

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