The Earth's climate is driven by the receipt and redistribution of solar energy. Despite this crucial relationship, the sun tends to be brushed aside as the most important driver of climate. Calculations on supercomputers are primitive compared with the complex dynamism of the Earth's climate and ignore the crucial relationship between climate and solar energy.

To reduce modern climate change to one variable, CO2, or a small proportion of one variable—human-induced CO2—is not science. To try to predict the future based on just one variable (CO2) in extraordinarily complex natural systems is folly.

In response, this is Sheehan's conclusion: "Heaven and Earth is an evidence-based attack on conformity and orthodoxy, including my own, and a reminder to respect informed dissent and beware of ideology subverting evidence."