During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well.
Evidence for Relatively Recent Mars Tectonics
Images of a martian landscape offer evidence that the Red Planet’s surface not only can shake like the surface of Earth, but has done so relatively recently. According to scientists from the University of London, the Open University, and the Geological Survey of Italy reporting their analysis of High Resolution Imaging Science Experiment (HiRISE) imagery, if mars quakes do indeed take place, Mars may still have active volcanism, which could help create conditions for liquid water. For more information, please see the AGU Press Release on this at http://www.agu.org/news/press/pr_archives/2012/2012-09.shtml.
