New York Times: To understand the complicated politics of climate change in the United States, you may want to talk to Pamela Johnson, president of the National Corn Growers Associations Corn Board. She is concerned about the weather. The drought that parched the lower 48 states cut the harvest at her northern Iowa farm by about 40 bushels an acre. For the first time in memory, she says, she had to rely on the federally subsidized crop insurance program to stay afloat. And yet Ms. Johnsons main concern, and...