From the Globe and Mail:

Some of the world's biggest grain exporters barred their farmers from selling in global markets yesterday, exacerbating the food price crisis for poorer nations that import their food and highlighting the failure of governments to nurture stronger rules for agricultural trade.

Rice and corn prices soared to records on U.S. markets and wheat jumped to its highest in a week after Kazakhstan, the world's fifth-largest wheat exporter, and Indonesia, a major rice producer, became the latest nations to impose export bans. The price increases further inflated global food costs that already had surged 48 per cent since the end of 2006.

The latest moves highlight the difficulty of solving a problem that has its roots in years of trade policy indecision, the push by richer nations to produce more fuel from food crops, growing demand from developing countries such as China, and Wall Street investors who see a money-making opportunity in surging commodity demand.

“Business as usual is no longer an option,” Paris-based UNESCO says in a sweeping report on the world agriculture system that was three years in the making and released yesterday. “There is a recognition that the mounting crisis in food security is of a different complexity and potentially different magnitude than the one of the 1960s.”