Thirty-one scientists from colleges and universities in Iowa have signed a letter urging all candidates — “from city council to President of the United States,” according to one professor — to recognize climate change. “As the global climate continues to evolve, our farmers and city planners will face new challenges to maintain the prosperity of our state and its role in national and global food security,” the authors wrote in the letter, pointing out that climate change could affect rainfall patterns and harm Iowa’s agricultural industry. The four authors planned to deliver the letter to Iowa Gov. Terry Branstad (R) today, and although it is not specifically addressed to the GOP presidential candidates, it will be read at the Iowa Energy Forum sponsored by Politico in Des Moines on Wednesday. Of the six GOP contenders, only former Utah Gov. Jon Huntsman has said he believes the science about climate change.