Angus Reid Global Monitor: While still high, the proportion of people in the United States who are concerned about climate change has dropped this year, according to a poll by Rasmussen Reports. 65 per cent of respondents believe global warming is a very or somewhat serious problem, down eight points since April. In addition, 43 per cent of respondents believe global warming is primarily caused by human activity, while 43 per cent blame long term planetary trends. The term global warming refers to an …