What Would Happen If All Americans Stopped Eating Meat?

Livestock farming and the meat industry accounts for 18% of human-produced greenhouse gas emissions.
But what if Americans shifted their diets away from meat and towards protein-enriched plants?
Business Insider reports it would significantly decrease CO2 emissions and reduce the amount of land used for livestock farming.
A new study shows that plant-based diets can be nutritionally equivalent than meat-based diets.