Humanactivityemitsfarlessmethane(甲烷)thancarbondioxide,butmethanehasabiggerimpactontheearth.Overthecourseof20years,atonofthegaswillwarmtheatmosphereabout86timesmorethanatonofCO2.Asaresult,methanehasbeenresponsiblefor23%oftheriseintemperaturessincepre-industrialtimes.Carbondioxidegetsmostoftheattention,butunlessmeth...
However, there’s another type of gas that is doing its own fair share of harm, and humans might be responsible for far more of it than we initially thought. It’s methane, anda new paper published inNaturesuggests that mankind should focus on curbing methane emissions sooner rather than la...
Other than the fact that high concentrations of methane are able to act as an asphyxiant by displacing oxygen in air, no studies were identified in which humans were exposed to methane gas and adversely affected. View chapterExplore book Methane Paul D. Lundegard, in Environmental Forensics, 19...
During closed-circuit anesthesia, the patient's inspired gas may become progressively contaminated by nonanesthetic gases. We studied the concentrations of , , and nitrogen as nonanesthetic gas contaminants in the circuit gas of 16 cases during closed-circuit anesthesia. After a "short" period of ...
Afterwater vapourand carbon dioxide,methaneis the most significantgreenhouse gas, resulting in about one fifth of atmospheric warming caused by humans. Methane emissions are mainly created by peatlands, animal husbandry, rice cultivation, landfill sites, fossil fuel production and biomass combustion. ...
Five subjects were exposed in a blinded fashion to escalating concentrations of FC23 between 10% and 60%, randomly interleaved with exposures to both room air and 40% nitrous oxide. On each study day, the subjects breathed the test gas for eight pulses of 3 min each with 2min clearance ...
(Fig.2a). Physical catchment variables such as river slope, elevation and gas-transfer velocity all have negative effects on modelled CH4concentrations. These effects are expected given that a higher slope and gas-transfer velocity favour gas exchange between the water and the atmosphere17, ...
Animals, including humans, are also a source of methane. While it is easy to measure atmospheric methane, understanding where it comes from is crucial for tackling the problem. By analyzing distinct isotope signatures in methane detected...
Accordingly, a sample of the chamber gas was analysed exactly 10 min after the animal had been placed in the chamber. The rat was then removed and the measurements were repeated on the subsequent day. The chamber was thoroughly flushed with room air before the next rat was placed in. ...
Lakes release methane (甲烷) to the atmosphere, accounting for up to 19% of total global emissions of this greenhouse gas. Most of the methane in lakes comes from microbes in the lake bed that consume organic matter and release methane as a waste product. This process usually occurs in low...