NDP plan savaged as ineffective and ‘devastating to the economy’ in new analysis. The Liberals have the most effective, least costly climate change policy of the four main federal parties, according to one economist, but the Conservatives are not far behind in second place. According to analysis by Simon Fraser University’s Mark Jaccard, the Liberals have the most effective and affordable plan, followed by the Conservatives, the Greens and, in a distant fourth, the NDP. Jaccard, a professor at the B.C. university’s School of Resource and Environmental Management, looked at the greenhouse gas (GHG) reduction targets set by each party and compared those to the policies they say will help reach those targets.