En tal sentido, su metodología es similar a la del IPCC y a la del Programa de Naciones Unidas para el Medioambiente (PNUMA), que concluyeron que un calentamiento global superior a ciertos niveles tendrá efectos realmente desastrosos.
As such, his approach is also similar to that of the IPCC and the UN Environment Programme (UNEP), both of which have concluded that global warming above a certain level will have truly disastrous effects.