would an increase in CO2 from 313ppm to 383ppm over 50 years worry you? No, but an increase from 313,000ppb to 383,000ppb would scare the crap out of me. Look

would an increase in CO2 from 313ppm to 383ppm over 50 years worry you? No, but an increase from 313,000ppb to 383,000ppb would scare the crap out of me. Look how much bigger and impressive my numbers are than yours?! Sorry, I couldn't resist. You really are talking ppm here, so keep in mind the number of 0's to the right of the decimal point before getting too concerned. That's not to say that in some systems, ppm increases are not concerning. However, your point was "it looks like a lot", and that's not valid, without actual perspective on how much a 1 ppm increase will effect the system.