I've got to run off all day again, but I do have a few minutes to share a most insightful article reviewing some of the "flaws" in Topher Field's "50 to 1 (denial) Project"
It is based on the Australian carbon tax (which I think has now changed). This carbon tax was estimated to reduce Australia’s CO2 emissions by 5%. Australia only emits 1.2% of the world’s carbon and so this would only reduce the world’s emissions by 0.06%. One can then estimate how much this would reduce the adjusted forcing associated with CO2 and then estimate how much this would reduce the warming over the next decade. The revenue associated with this Australian carbon tax was estimated to be $13 billion per year. That allows one to determine the cost per degree of warming per decade. The calculation then goes on to say that if we wish to prevent 0.17oC of warming over the next decade it would cost $420 trillion, or 80% of world GDP per year.
the overall costs of climate change will be equivalent to losing at least 5% of global gross domestic product (GDP) each year, now and forever. Including a wider range of risks and impacts could increase this to 20% of GDP or more, also indefinitely.