So looking at the world data the global warming effect of the whole world livestock production is 5.8% which is aproximately the same as the methane emissions of accidental leaks in the Energy sector industries.
It seems logistically much easier to solve the problem of coal mining leaks and Oil and Gas methane leaks created by a few multinational conglomerates, than to try and curb a fractured meat industry spread through multiple (often developing) countries.