"Climate Scientists" like Al Gore invoke the phrase "radiative balance" and claim that without the "greenhouse effect" the Earth's temperature would be 33 Celsius colder . The classic computations here show the maximally biased useless nature of that assumption . We are 10c warmer than if there were literally no greenhouse effect .
When these computations are applied to the parameters of Venus , they show James Hansen's claim that its surface temperature is due to a "runaway greenhouse effect" does not compute .
Below is a graph showing the calculation of Earth's radiative balance given a few different assumptions . If you have any questions or comments please post them below .
The blue and red curves are the Planck energy , black body , spectra of the sun , scaled to our distance from it , and of a black body in equilibrium with it . The areas under the 2 curves are equal . The temperature generating the red curve is 278.7 kelvin .The absorptivity of the earth with respect to the sun's spectrum is about 0.7 . There is a line across the sun's spectrum at 7 on the graph . The simple flat , gray , spectrum line is extended in very light blue across the graph .
Multiplying by 0.7 or any constant clearly won't change the radiative balance between the blue and red spectra . Thus a gray ball , no matter how dark or light , will come to the same equilibrium temperature . This is the fact ( Kirchhoff-Stewart ) that I learned as a grade school nerd during the Eisenhower administration which has driven my battling this global statist nonscience .
The greenhouse effect can be defined as the difference from this temperature due to the color , ie , spectrum , of an object .
The black line jumping to 10 ( 1.0 ) in the long wavelengths manifests the ubiquitous assertion that
without greenhouse gases , our planet would radiate as a black body .
It produces a temperature of about 255.7 . This number and 33c greenhouse
effect generated by this calculation has grossly retarded any
progress in climate science . The field , both sides , just
career around in their computational clouds somehow trying to make
sense of a quantity which is 2%3 their own creation .