I don’t think he’s in denial of covid, I think that he just doesn’t consider it to be dangerous enough to shutdown borders and industries. Latest mortality number from CDC puts Covid at .26%, which is statistically no worst than a bad flu. The only reason that total deaths will be higher than the flu in a given year are due to lack of antibodies.
As far as climate change goes I wrote a paper in college that basically says that we’re egomaniacs(Americans) if we think we can do enough to influence climate enough to be able to pick and choose where we inhabit this earth. The money and time spent on slowing climate change would be much better spent on relocation and infrastructure improvement. I’m not saying to not make a concerted effort to be green, just that there is no guarantee that our best efforts to slow it will be successful. Furthermore, history has shown us that life on earth thrived under much warmer temperatures than we currently have, and that the ice ages have been evolutionary bottlenecks.