In a previous post, John D. Vandenberg, a patent litigator in Portland, Oregon, laid out his vision of a carbon royalty:  using patents directly for the public good, by imposing a royalty to reduce carbon emissions.
A detailed discussion of the model can be found here in his Carbon Royalty Slide Deck and is illustrated below.
If you’re interested in exploring this idea please e-mail Mr. Vandenberg at patentsforthepublicgood@gmail.com.