I am only beginning, slowly, to educate myself on climate change so I am glad Charles is devoting the occasional thread to the topic. I am also glad to see LVQ’s contributions (please keep it civil!)

re: #30 HebrewToYou
My incomplete understanding is that it is not only possible to document a significant increase in CO2, but to determine that some proportion of the carbon atoms are of anthropogenic origin. How precisely this is done I am not sure, but I assume it has to do with the carbon isotope.