Here’s the question: What if everybody in the United States ate less meat? We don’t mean going vegetarian. Just less.

Is that realistic? “There is historical precedent,” said Richard Waite, an associate in the food program at the World Resources Institute . Overall, Americans eat about a third less beef than they did in the 1970s, he noted. It’s conceivable that we could make such a dietary shift again.

So, according to a study this month in the journal Scientific Reports, if everyone in the country reduced their consumption of beef, pork, and poultry by a quarter and substituted plant proteins, we’d save about 82 million metric tons of greenhouse gas emissions per year. That would be a reduction of a little more than 1 percent.

Just for comparison: If everyone in the country did go vegetarian, cutting meat out completely and replacing it with plant proteins of the same nutritional value, we’d save 330 million metric tons of greenhouse gas emissions per year. In that case, the savings would be about 5 percent.

Keep in mind, studies like this one necessarily include some assumptions about farming practices, dietary choices and even market forces. The numbers here are an estimate based on the average American diet and agricultural emissions data.