The ppm saturation point of CO2 is critical to determining the effect of increasing concentrations of CO2. (scienceofdoom.com)
Such a commitment imposes a limit on the volume of greenhouse gases that can be emitted over time, because warming is associated with increased concentrations of greenhouse gases in the atmosphere. (clivehamilton.com)
If fossil fuel production is not responsible for increasing concentrations of atmospheric methane, than what is? (earthobservatory.nasa.gov)