Province: Regardless of what the actual state of climate change may or may not be, Canadians who are adamant that we are nearing the point of no return have a problem on their hands. It would appear their highest-profile spokespeople have serious credibility issues. Federal Liberal Leader Stephane Dion never misses an opportunity to demand urgent attention to global warming. However, it has been well-documented that greenhouse-gas emissions increased under the previous Liberal government, …