Banning "climate change denial" isn't going to magically ensure the truth wins out either. Remember that terrifying news about the oceans having absorbed 60% more heat than we thought, meaning that global warming was far worse than previously estimated? It should've been immediately suspicious - ocean temperature was something we could and did directly measure with thermometers, making the claim unlikely on its face, and their method of measurement was weird and indirect. Yet it was uncritically repeated by every major news outlet and it fell to the "denialists" to spot that they'd majorly underestimated their error bounds and could not, in fact, exclude the possibility that the straightforward and direct temperature measurements were correct. The original authors have now retracted their big claims as a result.

HN discussion: https://news.ycombinator.com/item?id=18352506

The updated and corrected version of the BBC article it linked to: https://www.bbc.co.uk/news/science-environment-46046067