In fairness it is not just the Republican Party that believes in Neoliberalism, but it seems to adhere to the most puritan form of it. The principal tenets of Neoliberalism, free and unfettered markets and tight fiscal control are diametrically opposed to what is needed to fight climate change and its effects. Such policies involve massive fiscal spending and government investment in new infrastructure and renewable energy.  They  also involve wide ranging regulation of the private sector,  especially restrictions on the fossil fuel industry. Accepting the reality of man-made climate change and the policies needed to counter it really amounts to admitting that Neoliberalism has failed. The CLD tries to illustrate the self-reinforcing dynamic that may have led the leaders of the Republican Party to deny climate change. Of course, there are also other factors involved, such as party loyalty, internal pressure to conform, cognitive dissonance and probably many more. Please also have a look at Insight 66858 which is related to this subject.