A majority of adults in Canada, the United States and Britain believe global warming is a fact and is mostly caused by emissions from vehicles and industrial facilities, according to a poll by Angus Reid Strategies. At least 51 per cent of respondents in the three countries agree with this statement. Conversely, 21 per cent of Britons, 19 per cent of Canadians and 17 per cent of Americans believe global warming is happening but is mostly caused by natural changes. Also, 20 per cent of respondents in the U.S., 16 per cent in Canada and 16 per cent in Britain...