As you would expect from the National Geogrpahic they have wide ranging take on this issue that goes over 13 pages.
The first paragraph is tilted towards USA readers, but is apposite generally.
"It is the simplest, most natural of acts, akin to breathing and walking upright. We sit down at the dinner table, pick up a fork, and take a juicy bite, oblivious to the double helping of global ramifications on our plate. Our beef comes from Iowa, fed by Nebraska corn. Our grapes come from Chile, our bananas from Honduras, our olive oil from Sicily, our apple juice—not from Washington State but all the way from China. Modern society has relieved us of the burden of growing, harvesting, even preparing our daily bread, in exchange for the burden of simply paying for it. Only when prices rise do we take notice. And the consequences of our inattention are profound."
"Agricultural productivity growth is only one to two percent a year," warned Joachim von Braun, director general of the International Food Policy Research Institute in Washington, D.C., at the height of the crisis. "This is too low to meet population growth and increased demand."
"Such agflation hits the poorest billion people on the planet the hardest, since they typically spend 50 to 70 percent of their income on food". I reiterate to you , thats the real price of food when you don't have the hidden subsidy of oil. It's the high price of food when it is hand hewn. The real price you will have to pay to eat when peak oil hits home fully, perhaps 20 years time will be more than half your income. Think it through. What that must mean for things like rents and therefore house prices?
"Even China, the second largest corn-growing nation on the planet, can't grow enough grain to feed all its pigs. Most of the shortfall is made up with imported soybeans from the U.S. or Brazil, one of the few countries with the potential to expand its cropland—often by plowing up rain forest. Increasing demand for food, feed, and biofuels has been a major driver of deforestation in the tropics. Between 1980 and 2000 more than half of new cropland acreage in the tropics was carved out of intact rain forests; Brazil alone increased its soybean acreage in Amazonia 10 percent a year from 1990 to 2005. " So lets see. The world biggest producer of corn can't grow enough for its own needs. Where does that leave over populated over consuming places like Jersey that imports the vast majority of its food?
Read the appalling detail of the green revolution in the Punjab, How it starts of producing in abundance but leaves a legacy of saline land, undrinkable water and a huge rise in cancers. "The green revolution has brought us only downfall," says Jarnail Singh, a retired schoolteacher in Jajjal village. "It ruined our soil, our environment, our water table. Used to be we had fairs in villages where people would come together and have fun. Now we gather in medical centers. The government has sacrificed the people of Punjab for grain."
"But is a reprise of the green revolution—with the traditional package of synthetic fertilizers, pesticides, and irrigation, supercharged by genetically engineered seeds—really the answer to the world's food crisis? Last year a massive study called the "International Assessment of Agricultural Knowledge, Science and Technology for Development" concluded that the immense production increases brought about by science and technology in the past 30 years have failed to improve food access for many of the world's poor. The six-year study, initiated by the World Bank and the UN's Food and Agriculture Organization and involving some 400 agricultural experts from around the globe, called for a paradigm shift in agriculture toward more sustainable and ecologically friendly practices that would benefit the world's 900 million small farmers, not just agribusiness"
Of course the agribusiness sees it differently "So far, genetic breakthroughs that would free green revolution crops from their heavy dependence on irrigation and fertilizer have proved elusive. Engineering plants that can fix their own nitrogen or are resistant to drought "has proven a lot harder than they thought," says Pollan. Monsanto's Fraley predicts his company will have drought-tolerant corn in the U.S. market by 2012. But the increased yields promised during drought years are only 6 to 10 percent above those of standard drought-hammered crops." I have to tell you that tradition plant breeding and selection have done just as well as that. We have lost much of the gene bank that gave properties like drought resistance because we favoured yield. Home seed savers and traditional farmers have kept alive odd varieties that do show these useful traits.
"Regardless of which model prevails—agriculture as a diverse ecological art, as a high-tech industry, or some combination of the two—the challenge of putting enough food in nine billion mouths by 2050 is daunting. Two billion people already live in the driest parts of the globe, and climate change is projected to slash yields in these regions even further. No matter how great their yield potential, plants still need water to grow. And in the not too distant future, every year could be a drought year for much of the globe.
New climate studies show that extreme heat waves, such as the one that withered crops and killed thousands in western Europe in 2003, are very likely to become common in the tropics and subtropics by century's end. Himalayan glaciers that now provide water for hundreds of millions of people, livestock, and farmland in China and India are melting faster and could vanish completely by 2035. In the worst-case scenario, yields for some grains could decline by 10 to 15 percent in South Asia by 2030. Projections for southern Africa are even more dire. In a region already racked by water scarcity and food insecurity, the all-important corn harvest could drop by 30 percent—47 percent in the worst-case scenario. All the while the population clock keeps ticking, with a net of 2.5 more mouths to feed born every second. That amounts to 4,500 more mouths in the time it takes you to read this article.
Which leads us, inevitably, back to Malthus. "People who say Malthus is wrong usually haven't read him," says Tim Dyson, a professor of population studies at the London School of Economics. "He was not taking a view any different than what Adam Smith took in the first volume of The Wealth of Nations. No one in their right mind doubts the idea that populations have to live within their resource base. And that the capacity of society to increase resources from that base is ultimately limited"
http://ngm.nationalgeographic.com/2009/06/cheap-food/bourne-text