Why we must dare to debate

I have no expertise on the subject of global warming; nor do I have a strong view about it. But I do know attempted thought control and hostility to free speech when I see it; and I find these unlovely phenomena present among all too many of the enthusiasts for climate action. Words such as ‘denial’ are intentionally brought into the debate and recall those who deny the reality of the Nazi Holocaust.

Since my undergraduate days I have been carrying around a copy of John Stuart Mill’s timeless essay On Liberty, which contains the following stirring sentence: ‘If all mankind minus one were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind.’ Less often cited is another passage: ‘However unwillingly a person who has a strong opinion may be to admit the possibility that his opinion may be false, he ought to be moved by the consideration that, however true it may be, if it is not fully, frequently and fearlessly discussed, it will be held as a dead dogma, not a living truth.’