Levels of meat consumption in the West are totally unsustainable. Meat production in general uses huge amounts of water, vast areas of land (often driving deforestation) and diverts human-edible food into non-human mouths. Even relatively low-impact modes of production, like upland sheep farming in the UK, prevent land from being used for other purposes like reforestation, and contribute to the meat market in general.
The conditions in which most meat is produced is absolutely horrible too, of course.
Given that we're in an age of urgent climate and biodiversity crises, it's absolutely a good time to be reducing meat consumption - though, despite having been veggie myself for 20 years, I don't think it's necessary for everyone to cut out all meat/animal produce forever. Change is hard, habits are difficult to break and life without a few luxuries is far less enjoyable. But it's definitely time to start viewing meat as one of those luxuries, rather than a quotidian staple.
In particular, eat less beef. More generally, go for smaller animals, and omnivores rather than grazing ruminants: pigs and chickens are less damaging than cows and sheep.
(The arguments around seafood are a bit different - populations of pretty much everything popular are in long-term decline, many habitats are totally f.cked, and the industry is very difficult to regulate as it mostly takes place in the vastness of international waters.)
Luckily it's never been easier. There are huge numbers of great vegetarian and vegan recipe books and ready meals, and meat substitutes have never been better quality - for instance, swapping beef mince for a meatless alternative won't make much difference to the difficulty of cooking or the taste of the final dish.
In terms of the politics, at the very least we should stop subsidising meat production from taxpayers' money (outside of the rare cases where grazing is used as a conservation tool, perhaps). It's nuts that on the one hand we're paying to reduce, mitigate and adapt to climate change and biodiversity decline, and on the other hand paying people to accelerate it. As part of a "just transition", some of the money saved should be used to help farmers etc adapt their livelihoods, and some to help educate consumers. We need big-picture, joined-up thinking.
This pandemic wouldn't have happened without meat consumption, and previous near-misses have all resulted from meat production too. Even if conditions for workers in abattoirs were improved, for example by building lots more of them, it would be daft not to change meat-eating habits.
The amount of meat westerners eat is also, in general, unhealthy.
For an idea of what a diet optimised for both health and sustainability looks like, the EAT Lancet project is a good place to start.
https://eatforum.org/eat-lancet-commission/