This energy diagram will show you how. But the problem is that the Stefan-Boltzmann Law is derived from the integral of the Planck function for a single source of radiation. It may be used to show why direct solar radiation to Earth's surface cannot support a global mean surface temperature greater than about 233K or -40°C. But it cannot be used for the sum of solar and atmospheric radiation from greenhouse gases.
A cheap backyard experiment on a calm night with electric bar radiators and a thermometer can be used to prove the assertions about methane and carbon dioxide totally false, showing that the Stefan-Boltzmann Law does not work for multiple sources.Â
In his resignation letter to the American Physical Society (APS) top scientist Hal Lewis wrote about "the global warming scam with its literally trillions of dollars driving it, that has corrupted so many scientists, and has carried APS before it like a rogue wave. "
Lewis went on to say, "It is the greatest and most successful pseudoscientific fraud I have seen in my long life as a physicist. Anyone who has the faintest doubt that this is so should force himself to read the ClimateGate documents which lay it bare. (Montford's book organizes the facts very well.) I don't believe that any physicist nay scientist can read that stuff without revulsion.  ... So what has APS as an organization done in the face of this challenge? It has accepted the corruption as the norm, and gone along with it."Â
https://ssrn.com/author=2627605 and http://whyitsnotco2.comÂ