There's plenty of climate change reporting about the web. I just don't care to see HN lists articles that are ultra hot topics. You just get the same comments over and over again.
On the other hand, major announcements like the latest UN report frontally calling for a diet change are still allowed on HN, so there is some filtering going on - https://www.nature.com/articles/d41586-019-02409-7
Many of the same comments that we read each time is that its not clear that the weather is changing due to human action, or that its not clear if stop eating animal products would help that much, etc. which shows that a lot of people are still misinformed about the topic and in a state of denial.