> It feels so utterly helpless and pointless working on mitigating my own CO2 emissions when I learn there are people like you taking 100-150 international flig

> It feels so utterly helpless and pointless working on mitigating my own CO2 emissions when I learn there are people like you taking 100-150 international flights in 10 years. That completely dwarfs any savings I could reasonably expect to make. This is an oddly off-topic and mean-spirited comment! Looking at the comment thread you can see how this comment suddenly changed the course of the discussion to something totally unrelated to this post. This is one of those things that can create deeply nested comment threads on an unrelated topic just because of the nature of the comment and how it can trigger people to get involved in an off-topic debate.