Your comparison only makes sense if you also consider how many requests are being made.

The "only the biggest thing matters" is a faulty logic. If you truly care about the environment then we need to improve things across the board.

And moralizing about living beings doesn't help your cause here.

It might not help the cause, but ultimately it's an uncomfortable truth. It's easy to dismiss a fact as 'moralising'.

It's simply a fact that animals suffer when they are factory farmed and then killed. It's a fact that they are living sentient beings. You can be totally okay with that, but the reality is that most people are only okay with it because it doesn't happen right in front of them.

I used to eat meat, btw. And I also used to attack people for 'moralising'. I now realise this was my brain trying to defend itself; to try to make sense of why I would pet a dog but eat a pig (everyone else is doing it, this person is just different and wrong, go away bad vegan person!)