The Ipsos MORI poll found six out of ten respondents questioned the connection between the effects of human emissions and lifestyles and climate change.
A total of 40 per cent of interviewees thought "climate change might not be as bad as people say".
But a total of 60 per cent of the 1,039 adults surveyed did agree that "many scientific experts still question if humans are contributing to climate change".
Three-quarters of respondents said they were "concerned about climate change".
Phil Downing, Ipsos MORI's head of environmental research, told the Observer: "People are broadly concerned, but not entirely convinced.
"Despite many attempts to broaden the environment movement, it doesn't seem to have become fully embedded as a mainstream concern."
Jonathon Porritt, chairman of the government's Sustainable Development Commission, said the poll?s findings were "disappointing" and added the government "will be really worried".
Ipsos MORI said university-educated people in social classes A or B, with a higher income, were most likely to be worried about climate change.
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