There is one other little consideration for those of you who think that we should have carbon tax in spite of having a forest area offset...CO2 is the fertilizer of photosynthesis . Have not ran into a single university graduate level plus scientist that would disagree with that yet. The scientific community was counting on CO2 levels to increase to provide adequate food supply. There are a number of studies out there suggesting that massive starvation will result from just maintaining  the CO2 at the current level....we are not just talking about tens of millions per year. We need to have an alternative fertilizer in place before we travel down this road , as I and others see it.