| URL | Priority | Change frequency | Last modified (GMT) |
|---|---|---|---|
| https://keelingcurve.ucsd.edu/2013/12/26/a-letter-of-appeal-from-ralph-keeling/ | 60% | Monthly | 2020-11-19 19:31 |
| https://keelingcurve.ucsd.edu/2013/12/03/what-does-400-ppm-look-like/ | 60% | Monthly | 2020-11-19 19:31 |