The obvious practical meaning of all this is that the fundamental problems we face today — nuclear war, population growth, pollution, the intolerable gap between the rich nations and the poor ones, the intelligent use of scarce world resources — are global in scope.
[Perhaps this is
obvious, but since nothing seems to
obvious to state explicitly here, when I say «you use the same equations», I
mean the standard equations used in all radiative transfer calculations, i.e., those used by scientists and engineers in
practical calculations every day (as David M Hoffer has pointed out).]