Americans have a big appetite for everything meat. We smoke it, grill it, slice it, and chop it.
The typical American puts away around 200 pounds [.pdf] of beef, pork, and poultry every year . That's true in many of the wealthiest countries. But developing countries are showing a growing appetite for meat.
"Globally there have been very strong increases in livestock product demand," said Thomas Hertel, an agricultural economist at Purdue University. "Most of those increases have been in the poorest countries and the (most) populous countries of the world. China and India for example."
Satisfying that demand sets up one of the biggest challenges for agriculture over the next few decades.
By 2050, there will be 9.6 billion people in the world, making for more potential meat eaters. On top of that, Hertel said, incomes are expected to rise in places like Southeast Asia and Sub-Saharan Africa.
"As they get more income, they spend a lot of that on livestock products," Hertel said. "And that's what's fueled these dramatic increases in livestock product consumption in much of the world."
The United Nations estimates the world will need to produce an additional 220 million tons of meat per year by 2050 [.pdf - page 77]. That's billions more chickens, pigs, and cows. Those animals are mostly fattened up on corn and soybeans.
Farmers from the American Corn Belt to Argentina to Russia are planting massive crops and plowing up land to grow those ingredients for livestock feed, and they're making big changes to the environment in the process.
Take China, where the growing middle class is hungry for meat, and livestock are hungry for corn and soybeans.
"They're importing (soybeans) like mad," Hertel said. "They're importing them from the U.S. They're importing them from Brazil and Argentina. So you see the massive expansion into the Brazilian Cerrado."
Ken Cassman, who studies global agriculture at the University of Nebraska-Lincoln notes that "the increased demand for livestock has been, even larger than population growth, the largest force in demand for food globally, and thus putting pressure on land resources"
From 2002 to 2011, the world plowed up another 25 million acres of land each year for farming – an area roughly the size of Indiana. Cassman said scientists are in a race against time, to help farmers grow more grain so less land is put to the plow.
"If you can't, production of meat and crops will come from converting natural habitats that store biodiversity and carbon," Cassman said. "It will come at the expense of clearing those lands."
To avoid that, Cassman said global yields per acre will need to double. No small task, but there are parts of the world with a big production gap. The farms have good soil and good weather but aren't raising much.
Give farmers access to modern tools – better seed, bigger machinery, more pesticides, advanced fertilizer – and they won't have to take more land. That kind of intensive agriculture has its own problems. In the U.S. Corn Belt, for instance, many rivers and streams are contaminated with high levels of fertilizer runoff. Science must address that, Cassman said, because it's no good to push farm productivity without regard to the environment.
But there is also a risk in shying away from industrial scale farming.
"Farming without fertilizers reduces nutrient runoff, but if everyone did that we'd have to cut the Amazon rainforest down," Cassman said.
Of course, the world wouldn't have to make so much meat if everyone ate less. In fact, meat-loving Americans have backed off a bit from beef as prices have gone up. But meat is a luxury few will be willing to give up, Purdue University's Thomas Hertel said.
"You could say the best way to manage carbon emissions is don't drive cars anymore. Everyone walk to the office," Hertel said. "Is that going to happen? No. And people aren't going to stop eating beef."
That leaves the meat industry with a lot of work to do to fill global demand. In the meantime, there are a lot of other issues to chew on, like health concerns over how much meat Americans eat and questions about how antibiotics are used.
By the time 2050 comes around the meat on your plate may not be that different, but the story of how it got there could be.