Despite the establishment of the United Nations Framework Convention on Climate Change (UNFCCC) in Rio two decades ago, the global debate has been dominated almost exclusively by climate scientists and policy-makers.
There is one less simple explanation: a reported disagreement within Israel's defence establishment over whether or not to ratify the new international convention against chemical weapons.
Nowhere is the disconnect between grassroots conservatives and Establishment Republicans more apparent than in Florida, the site of the upcoming Republican National Convention.
In other words, although the state Republican convention in June confirmed Mr Schaffer as the activists' favourite, it made sense that the establishment had already ditched him and persuaded Mr Coors to run.