ROME – Scientists and development experts across the globe are racing to increase food production by 50 percent over the next two decades to feed the world’s growing population, yet many doubt their chances despite a broad consensus that enough land, water and expertise exist.

The number of hungry people in the world rose to 1.02 billion this year, or nearly one in seven people, according to the U.N. Food and Agriculture Organization, despite a 12-year concentrated effort to cut the number.

The global financial recession added at least 100 million people by depriving them of the means to buy enough food, but the numbers were inching up even before the crisis, the United Nations noted in a report last week.

Agronomists and development experts who gathered in Rome last week generally agreed that the resources and technical knowledge are available to increase food production by 50 percent in 2030 and by 70 percent in 2050 – the amounts needed to feed a population expected to grow to 9.1 billion residents in 40 years.

But the conundrum is whether the food can be grown in the developing world where the hungry can actually get it, at prices they can afford. Poverty and difficult growing conditions plague the places that need new production most, namely sub-Saharan Africa and South Asia.

The track record of failing to feed the hungry haunts the effort. But other important uncertainties also give pause. The effect climate change will have on weather and crops remains an open question. The so-called green revolution of the 1960s and '70s ended the specter of mass famines then, but the environmental cost of chemical fertilizers and heavy irrigation has spurred a bitter divide over the right ingredients for a second one.

In addition, the demand for biofuels may use up crop land. And as scores of food riots in 2008 showed, oil prices and other income shocks can quickly drive millions more people into hunger, sending ripples of instability around the world.

A summit meeting of world leaders in Rome on Nov. 16 is expected to address the future food demands. Since July, the richest countries have ostensibly committed more than $22 billion to the effort over the next three years. (NYT)