Des Moines Register: In an appearance today at the Iowa State Fair, U.S. Secretary of Agriculture Tom Vilsack defended efforts by the Obama administration and Democrats in congress to pass climate change legislation, saying “I start from the proposition that climate change is real. I know some disagree.” Vilsack said the rest of the world is looking for leadership from the U.S. on climate change. “If we don’t lead, international cooperation on a whole host of other issues, such as trade and …