Kind of a loaded headline. Which questions / issues are they denying:
(1) is the Earth warming?
(2) if the Earth is warming, how much of the warming is caused by an increase in CO2 emissions?
(3) if the Earth is warming because of increased CO2 emissions, is the resulting warming desirable (what are the costs and benefits of the human-caused warming)?
(4) if the Earth is warming because of increased CO2 emissions and the rate of such warming is undesirable, what effective steps are possible to reduce the CO2 emissions given that India and China have no intention to reduce emissions until their standard of living has dramatically increased?
(5) if the Earth is warming because of increased CO2 emissions, the rate of warming is undesirable, and there are effective steps possible to counter the increased CO2 emissions, what public policies should be implemented?
Denying climate change means a lot of different things to different people. If one agrees that there is warming (or climate change) but that such warming is desirable, is that person a doubter? If one agrees that there is warming, it is undesirable, but there are no effective steps to take to combat it, is that person a doubter?
Maybe the skeptics in the U.S. are better informed and less inclined to believe every climate alarmist headline. Who knows.