This year's heat wave is part of a broader trend of rising temperatures in Iowa, according to a new report released last week by the Iowa Public Interest Research Group (Iowa PIRG). The average temperature in Des Moines is up 1.5 degrees Fahrenheit since 2000 compared with the previous three decades (1971 through 2000). In the continental United States , the first seven months of 2006 were the warmest January-to-July period of any year on record, according to the National Climatic Data Center. In Iowa , the average temperature was the third warmest January-through-July on record. To examine how these recent temperature patterns compare with temperatures over the past 30 years, Iowa PIRG's researchers analyzed temperature data from 255 major weather stations in all 50 states and Washington, D.C., for the years 2000 through 2005 and the first six months of 2006. Research was collected from four Iowa cities: Des Moines, Waterloo, Dubuque, and Sioux City. In August, Iowa PIRG released a report showing how the U.S. could cut global-warming pollution by nearly 20 percent by 2020 by making homes, cars, and businesses more efficient; switching to renewable-energy sources; and giving Americans more alternatives to driving, paired with strong, mandatory limits on global-warming emissions. For more information, visit (http://www.iowapirg.org).