The fact that he was repeating known lies - in contradiction to the science and EPA's own documentation - on a conservative talk radio show is how "conservatives" falsely inform themselves. They deny the science, and reinforce that denial by repeating it ad nauseam in their bubbles. Liberals do the same, though in most cases they at least get the science right (the exceptions include anti-vaxxers and anti-GMOs).
A study published this past April in the journal Nature Human Behavior helps explain at least part of this discrepancy - liberals and conservatives read totally different books about science.
The study took advantage of the feature on Amazon and Barnes and Noble websites that offer suggestions for similar books when you buy one. The "other books bought by people who bought this book" feature creates links between thousands of books, and thus the books it selects provide substantial information about buying habits. The researchers looked at political books with either a liberal or conservative slant, then examined the list of science books offered as "linked."
The good news is that people who buy political books (whether clearly liberal or clearly conservative) do tend to also buy books about science subjects rather than non-science subjects. But the researchers also found that there is a difference between the science books read by liberals and conservatives.
Liberals prefer to read books from disciplines focused on basic sciences such as anthropology, astronomy, and zoology, while conservatives are more likely to purchase books that focus on applied sciences such as organic chemistry, medicine, and law.
The real stunner, however, is that even when liberals and conservatives choose within the same discipline they rarely buy the same books. For example:
buyers of conservative books in the domains of climate science, environmental science, political science, and biology tend to purchase books that are tightly clustered on the periphery of the discipline's co-purchase networks, while liberals are more likely to buy a diverse set of books...
In a nutshell, conservatives primarily buy books that reinforce their narrow view of science while liberals buy a greater diversity of books that expand their knowledge and understanding.
This explains, in part at least, why liberals are more likely to have a better understanding and acceptance of scientific consensus, for example on evolution and climate science, while conservatives choose to dismiss the consensus in favor of a more narrow interpretation guided by political ideology. Again, the problem isn't exclusively to conservatives as there are far left liberal views that also deny the totality of the science. This liberal denial, however, tends to be a much smaller fringe wing than the conservative denial, which today has largely enveloped the entire "conservative" movement and, indeed, the Republican party has become the party of denial.
The authors conclude that their study:
...underscores the need for research into remedies that can attenuate selective exposure to 'convenient truth', renew the capacity for science to inform the political debate and temper partisan passions.
The full study can be read online.