Chemical fertilizers and animal waste contain nitrates and phosphorus that can get washed with rain or snowmelt into the state's rivers. That affects Iowa's more liberal urban centers which rely on rivers and lakes for drinking water.

Record high temperatures this year forced European wine producers to harvest grapes much earlier than usual. French wineries fear it will lead to the worst season in 30 years. But Nordic newcomers to the world of wine are toasting what they believe will be a vintage harvest, thanks, in no small part, to climate change. Special correspondent Malcolm Brabant reports from Sweden.