Climate change is a contentious policy issue (Tol 2014; Nordhaus 2013). There is a great deal of uncertainty concerning climate change, especially regarding (1) the projected increase in average global temperatures (McKitrick & Christy 2019a; Lewis & Curry 2018; Hourdin et al. 2017; Millar et al. 2017; McKitrick & Vogelsang 2014); (2) the regional changes in climate that might be expected (Koonin 2021; McKitrick & Christy 2019b; Pielke 2018; Lomborg 2007); and (3) the contribution to global warming of human activities (e.g., burning of fossil fuels, land use changes) versus that of natural factors (e.g., CO2 release from or absorption by oceans, changes in the sun’s activities) (Koutsoyiannis 2021; Maher et al. 2020; Lindzen 2020; Zharkova et al. 2019; Frank 2019; Richard 2019; de Larminat 2016, 2019; Svensmark et al. 2017; McKitrick & Nierenberg 2011; McKitrick & Michaels 2004, 2007; Khilyuk & Chilingar 2006; de Laat & Maurellis 2004, 2006).