Thus, it is clear that American opinion about global warming is solidifying. Majorities now believe it is real, happening, human caused, and a serious threat. Likewise, majorities want their elected officials at all levels to take more action and support a variety of policies to reduce national greenhouse gas emissions. Growing numbers of Americans are also willing to express their views politically and through their consumer purchases. Thus there is now a large and growing issue public in support of concerted local, state, and national action, but this public remains relatively disorganized. The success or failure of climate change action in the United States will depend, in no small part, on the ability of leaders, organizations, and institutions at all levels of society to effectively educate, organize, and mobilize the American public.