It’s also not something I nor anyone else here has said. It’s a total strawman.
It's not just about this place, it's about the average person. Every time this topic comes up, people always get very defensive and take it personally, often times even going on about "I already do all this, and that, and some other things, what else can I do?". Well, chances are the criticism is not directed at you, then.
The criticism is directed at the people who base a big part of their diet on red meat; it's directed at people who make excuses to drive when they could have easily walked or taken a bike but thought driving was more convenient and comfortable; it's about people who have access to public transports but don't want to take them because they'd have to walk five minutes to or from the station, or don't want to "smell other people", or just want "the privacy of my own car". It's directed at people who could do more, but actively chose not to, and then blame the system and say policy needs to change.
Policy would mean not subsiding red meat, therefore making it more expensive; it would mean raising prices of gas and forcing those people to walk more or ride more public transports; it would mean anything made of plastic would be a lot more expensive, and anything that needs to be shipped somewhere would be too.
How many people do you think would actually be okay with those policies, when they won't even do it out of their own free will when given the option? How long until they regret it and vote for someone who undoes all the policies?
Even if we ignore all that and say that voting is the most important thing, how many green and ecological parties do you see winning elections around the world?
No matter how you measure it, it's clear most people are not pushing that hard for change. The average person is choosing convenience and comfort over everything else, and just hopes someone else will sort out the problems - in a way that doesn't really affect them or their choices. It's also the reason there's such a large push from the average "environmentally aware" person for electrical vehicles (even though they're still bad for the environment) instead of more transports; it would mean not having to change anything in their lives.