"Climate change has already provoked debate in a U.S. presidential campaign barely begun. An Associated Press journalist draws on decades of climate reporting to offer a retrospective and analysis on global warming and the undying urge to deny." -- Editor's Note regarding this piece by Charles Haney, The American ‘allergy’ to global warming: Why? [link].
Nice, concise overview of the state of climate science and "denialism" in the United States.