Earlier quoted context omitted.
Right just a little bit of restraint. On an unprecedented scale of coordination by hundreds of millions to billions of people - a scale of cooperation that has probably never occurred in human history (and there's no reason to believe it will any time soon). But sure, if people "just" did a "little", it would go a long way. Just a _little_ restraint from the entire population all at once in perpetuity. No big deal.
You do this through the government. Implement meat rations. Everybody is only allowed so much meat per week. So you have to make it count.
There are already precedents for that, for example here in Germany cigarettes are taxed to about 70% and hard-liquor (altho it's more complicated to calculate as it depends on exact alcohol content) to about 40%.
Meat is only taxed at 7% via VAT (similar to sales tax in the US).