Whenever it does get mentioned in the comments sections of the media it is always met with accusatory replies mentioning genocide, euthanasia and the trite: "after you".
There is never any meaningful discussion about how, when and why it might be needed. Those of us who do mention it get accused as racists and baby killers and that is enough to close it down.
If these comments only came from those who claim climate change and environmental destruction are hoaxes they would be understandable, but they are not. Very often they come from otherwise intelligent and rational people and that, to me, is a big worry.