What deniers of climate change must deny
Deniers of climate change must reject the entire scientific enterprise in order to cling to their denial while lying to themselves and others about their own behavior. They cannot even admit to their own truth let alone anything external to themselves like whether the climate is warming and what might be causing it.
My proof is evident in any denier posting anywhere in the world. Each of their postings contains words and assertions but no evidence, sources, or facts that can be checked.