In Europe and the United States, food prices for items like pizza and bread have increased significantly as grain stores shrink and wheat prices rise.
The price of wheat and rice are double those of a year ago, and corn is a third higher, the UN Food and Agriculture Organization said this week.
"Food price inflation hits the poor hardest, as the share of food in their total expenditures is much higher than that of wealthier populations," said Henri Josserand of the Food and Agriculture Organization.
Biofuels are not, of course, the only reason for high food prices. Fuel to transport food is more expensive with oil more than $100 a barrel. There have been unexpected droughts this year as well.
Should we conclude that all biofuels are bad?
No. But motivated by the obvious problems now emerging, scientists have begun to take a harder look at their benefits.
For example, the European Environment Agency advisory panel suggests that the best use of plant biomass is not for transport fuel but to heat homes and generate electricity.
To be useful for vehicles, plant matter must be distilled to a fuel and often transported long distances. To heat a home, it can often be used raw or with minimal processing, and moved just a short distance away.
汉翻英
是介绍上海世博会的
比较简单。就没贴出来了。