Extension (and clarification) of Fabulous Free Money Offer

This is an extension--and clarification--of my Fabulalous Free Money Offer to Andrew Dessler.

I will give an additional $10 (so now we're up to $40, total) for your CERTIFIED BEST EFFORT predictions of atmospheric methane concentrations every decade from 1990 to 2100.  I want them in the same format as your other predictions, i.e., "5% probability, 50% probability, 95% probability".  See my Fabulous Free Money Offer of yesterday for details.

One more thing...an important clarification:  I want your predictions to be in the same conditions as mine and the IPCC's...without government mandates for GHG emission reductions.

Again, if you are at all uncertain about any of the conditions for these fabulous offers of free money, please ask me questions.