How accurately can we track CO2 concentration over long timespans? I get that climate science is hard and produces nebulous answers based on arguably nebulous d

How accurately can we track CO2 concentration over long timespans? I get that climate science is hard and produces nebulous answers based on arguably nebulous data, but when I read about about ocean acidification and see the long-term graphs from respected organizations [1] as a layman it's really quite alarming. I.e. maybe the climate won't spiral out of control, but it seems reasonable to be concerned about the alarming levels of CO2. As a new parent I'd love to have my dire fears of catastrophe awaiting future generations assuaged by rational hard science, but (as a layman) everywhere you look the picture is pretty bleak. 1: http://www.esrl.noaa.gov/gmd/ccgg/trends/history.html http://www.esrl.noaa.gov/gmd/ccgg/trends/history.html