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Setting ambitious carbon reduction targets, but not following up with equally ambitious policies, has made for good politics, SFU energy economist and Nobel laureate Dr. Mark Jaccard tells a Vancouver conference on “Building a Green Economy.” But if ecological and economic catastrophe from climate change is to be avoided, politicians must walk their talk. One reality is now unavoidable, Dr. Jaccard says: the only way to effectively reduce greenhouse gas emissions that cause global warming is …