The average American currently eats over a pound of beef each week (roughly equal to 4 burgers), and beef is between five and ten times worse for the climate than chicken.
The U.S. produces one-fifth of the world's beef, which is responsible for nearly 10% of global greenhouse gas emissions.
Thus, reducing beef consumption to 1 burger per week (the maximum amount consistent with a sustainable global emissions level) would eliminate 1.5% of global greenhouse gas emissions.
A 2016 study shows that if, in 2050, the world ate half as much red meat as it's projected to, we could reduce annual emissions by an amount equivalent to the emissions from all U.S. power plants, agriculture systems, and homes combined.
Global halving of red meat consumption could avoid over 2 million deaths annually.
Put another way, global halving of red meat consumption could reduce overall global emissions by nearly 10% from current levels.