Rather than waiting decades to see the effect of a gradual rise in CO2, a handful of studies have immersed stands of trees in a continuous bath of extra CO2, several hundred parts per million above ambient levels of about 400 parts per million. (sciencemag.org)
The study, titled «Deployment of a sequential two - photon laser - induced fluorescence sensor for the detection of gaseous elemental mercury at ambient levels: fast, specific, ultrasensitive detection with parts - per - quadrillion sensitivity,» was published in the Dec. 8 issue of the journal Atmospheric Measurement Techniques. (sciencedaily.com)
I had just made it through the games vast and ambient level selections, massing to approximately 70 levels. (metacritic.com)