I'll take a stab at that.
At Environment Canada--or at the other two departments--we don't currently have a study that would definitively answer that question. However, an evaluation of SARA is under way as we speak. We won't have the results of it for a number of months.
The only other point I would flag is that whenever a listing decision is put before the Governor in Council, we must complete a regulatory impact analysis statement as part of the cabinet directive on streamlining regulations. In that, we need to flag socio-economic considerations for any listing decision.