That is, how much warming effect is likely compared to some simple baseline of just taking direct absorption by changing levels of CO2. (realclimate.org)
The approach, called tunable infrared laser direct absorption spectroscopy, detects the ratio of methane isotopes, which can provide a «fingerprint» to differentiate between two common origins: microbial, in which microorganisms, typically living in wetlands or the guts of animals, produce methane as a metabolic byproduct; or thermogenic, in which organic matter, buried deep within the Earth, decays to methane at high temperatures. (sciencedaily.com)
The new approach, called tunable infrared laser direct absorption spectroscopy, relies on the ratio of methane isotopes. (natureworldnews.com)