I cannot accept that it would be inside a well educated circle like hackernews. It should not be any more controversial than flat earth theory or moon landing conspiracies.
So, I think it's reasonable for me to try to understand, anthropologically speaking, the mindset of a modern climate change denialist. My uncharitable and editorialized descript of their perspectives is perfectly justifiable. These people are actively perpetuating information and policy decisions that will cause the deaths of millions in the next century, the displacement of 100s of millions of more, and a reduction in the quality of life of billions.
They are not worthy of my civility. Civility is what is leading to the the status quo where we as a society - both left and right - have just accepted that the great barrier reef will be dead within a decade, and our children's children will only read about coral reefs in textbooks.