"There certainly are going to be lots of challenges in the future. Temperature is one of them, water is another," said Lisa Ainsworth, a molecular biologist with the United States Department of Agriculture. Spiralling grain prices in recent months have startled governments long used to affordable rice, wheat, soy and maize.
But rising demand and likely greater climate variability and more fluctuations in crop output could mean even more uncertainty for prices. Current estimates suggest demand for cereals will jump by more than 50 percent by 2050 as the world's population rises from 6.6 billion to about 9 billion.
The world has already warmed by about 0.7 degrees Celsius on average since the 1800s and studies show higher temperatures can cut yields, particularly in the tropics where a lot of rice is grown. "In
Pollution is another threat. Ozone, which is produced at ground-level by sunlight interacting with pollution from burning fossil fuels, can cut plant productivity. The higher the ozone levels, the worse the damage. In the northern hemisphere, ozone is a growing problem and is estimated to cost farmers billions of dollars in lost production.Terraces, conservation tillage and conservation buffers save soil and improve water quality on this farm in Woodbury County in northwest Iowa. 1999. Photo by Lynn Betts, USDA Natural Resources Conservation Service, Wikimedia Commons