On August 12 at 8:30 a.m., the U.S. Department of Agriculture released its monthly estimate of the world grain harvest, reporting a 32-million-ton drop from the July estimate. When grain futures markets opened later in the morning, prices of wheat, rice, and corn jumped.

This 32-million-ton drop, equal to half the U.S. wheat harvest, was concentrated in Europe where record-high temperatures have withered crops. The affected region stretched from the United Kingdom and France in the west through the Ukraine in the east. The searing heat damaged crops in virtually every country in Europe.

The soaring temperatures of the past several weeks rewrote the record book. On August 10, the temperature in London reached 100 degrees Fahrenheit (38 degrees Celsius)—the first triple-digit reading on record in the United Kingdom. France had 11 consecutive days in August with temperatures above 35 degrees Celsius (95 degrees Fahrenheit). In Italy, temperatures reached 41 degrees Celsius (105 degrees Fahrenheit).

The heat wave in Europe started in early summer when Switzerland, situated in the heart of Europe, experienced the hottest June since recordkeeping began 140 years ago. In July the heat wave spread across the rest of Europe.

Crops suffered the most in Eastern Europe, which is harvesting its smallest wheat crop in 30 years. In the Ukraine, the wheat crop, already severely damaged by winter kill, was reduced further by the heat, plummeting from 21 million tons last year to 5 million tons this year. As a result, the Ukraine, a leading wheat exporter last year, has been forced to import /css/million_tons_by_4_percent__the_world_is_engaged_in_a_massive_drawdown_of_grain_stocks.__See__a_href__x5giqxeuerweqxogt4gjwn.css"/datacenter/xls/update27_1.xls">data.) With this year's drawdown, world grain stocks have dropped to the lowest level since the early 1970s. When world grain stocks dropped to a dangerously low level in 1973, world prices of wheat and rice doubled.

As atmospheric carbon dioxide (CO2) levels climb higher each year in an unbroken ascent, they are creating a greenhouse effect, raising the earth's temperature. Over the last quarter century the earth's average temperature has risen 0.7 degrees Celsius or more than 1 degree Fahrenheit.

As temperatures rise, crop-withering heat waves are becoming more and more common. Last year the grain harvests in India and the United States were hit hard by high temperatures and drought. This year Europe is bearing the brunt.

During this life-threatening heat wave Europeans may have felt that the temperature could not rise much higher, but the Intergovernmental Panel on Climate Change (IPCC), a group of some 1,500 of the world's leading climate scientists, is projecting a rise in average global temperature of somewhere between 2.5 and 10.4 degrees Fahrenheit (1.4 to 5.8 degrees Celsius) during this century if we continue with business-as-usual energy policies.

Even if the earth's temperature increases only a few degrees, as in the low end of the IPCC projections, we will likely see heat waves far more intense than anything we can easily imagine. If rising temperatures shrink harvests and drive up food prices, consumer pressure to reduce the use of fossil fuels will intensify. Indeed, rising food prices could be the first global economic indicator to signal the need for a fundamental shift in energy policy, one that would move the world toward renewable energy sources and away from climate-disrupting fossil fuels.

Copyright © 2003 Earth Policy Institute