As for the lifestyle, some changes will be required. I did say "no drastic" changes, but there will be a lot required nevertheless.

About changing our diets ... some time back I experimented with the idea of eating less meat. Then I tried stopping altogether. Now it's become a habit and I can't imagine ever switching back to the meat days. Why am I mentioning this? Because just by experimenting with this I started realizing how much everything in France is based on meat. Meat is even a norm of social interaction, here. i.e. when you're having someone for dinner, you don't think: "what will I prepare for dinner?" but "what main dish with meat will I prepare for dinner?".

So what needs to be done requires deep changes in mentality: start explaining to French people that it's not a good thing that their diet now consists of eating 100% more meat than 50 years ago. Not good for their health, not good for the planet, not good for animals, and not good for farmers who are now entrenched, because of meat (which consumes up to 70% of all vegetable growth as cattle feed), in a logic of over-production. Ultimately not good for humanity because of all the pandemics that farmed animals can cause ...