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Because, as meat consumption produced less than a fifth of all greenhouse gas emissions, the claim that "it won't improve until the world population starts limiting its meat intake" is simply false.

Reducing meat production would help, certainly. But it ain't a blocking requirement to getting global warming under control.

As an aside, while I'm choosing to accept that 18% number, counting methane in that list is a bit misleading as, while it is a far more powerful greenhouse gas, it has a far shorter lifetime in the atmosphere than CO2.