Carbon tax to impact SarniaLIBERAL GREEN SHIFT KEY PLANK IN PARTY'S CAMPAIGN Posted By SHAWN JEFFORDS, THE OBSERVER Posted 17 hours ago Green shift or green shaft? That's what Sarnia-Lambton must decide as it ponders the Liberal Party's controversial carbon tax to reduce greenhouse gas emissions and the impact it would have on the Chemical Valley and consumers. Dean Edwardson, general manager of the industry-funded Sarnia-Lambton Environmental Association, said he's skeptical of Liberal leader Stephane Dion's "Green Shift" strategy. "Anytime you bring a new tax in there's an impact," Edwardson said. "It's difficult to determine what the impact will be...