And then you have the ones who agree that global warming is happening, but deny that it is human-caused. This is the most insidious, because it is the most difficult to spot and, I suppose, to prove.

We can show them the results of climate change in the movements of species to colder areas, and they can’t deny this. Showing it as a direct result of human activity may be a little harder.

Moreover, it is not necessarily an aspect of business practice to deny facts. There are many business models that include the facts. The denial, then, is not necessarily a feature of business, but simply of stupidity, or perhaps simply avarice.