2010-12-17 16:24:42One tiny comment for any future revision.
Jim Meador


John you should be really proud of this document. I really love it. 

(Sorry to have dropped off the map for a while. Between work, volunteering for various political causes in the run-up to the US midterm elections, etc, I did not have much time left for SkS.)

I'd rather see the graph inverted in Human Fingerprint #1, so that it shows the ratio of C12 to C13.That way the graph would ramp upward, in the same way that the CO2 graphs, temperature graphs, etc ramp upward. And I think it would allow a rewrite of the text that would read a bit more smoothly...

 "...So when we burn fossil fuels, we're sending more of the lighter Carbon-12 into the air. Thus we expect to see the ratio of Carbon-12 to Carbon-13 rise."

This is just a minor point, but it smooths out that cognitive transition from "more" to "fall" that exists in the current text. 

2010-12-21 14:42:23C12/C13
John Cook

I went with the conventional expression of the ratio of C13 to C12. I suppose I could invert the Y-axis - or I could recalculate the C13/C12 ratio (but that would require getting hold of the original data... hmm, I do know the author of that paper... but it would also be a lot of work... sorry, thinking out aloud here). I'll rethink taking the path of least resistance and possibly inverting the Y-axis in a future edition.
2010-12-31 10:57:42Some helpful links for you john...
Robert Way