In this update on Global Warming's Six Americas, we report that the Alarmed have grown from 10 percent of the American adult population in 2010 to 16 percent in 2012. At the same time, the Dismissive have decreased in size, from 16 percent in 2010 to 8 percent in 2012. The report focuses on how the six groups perceive the benefits and costs of reducing fossil fuel use or global warming; their support for different national climate change and energy policies; and their beliefs about who has influence over the decisions that elected officials make...