The survey of 119 MPs from all parties was commissioned by PRWeek from Populus to establish the attitudes of parliamentarians to climate change and environmental issues as part of a special report on the subject.
Only 51 per cent of MPs agree that it is an established fact that global warming is largely man made, though there are substantial differences between parties.
Nearly three-quarters (73 per cent) of Labour MPs agree that man-made global warming is now an established scientific fact compared with 30 per cent of Tory MPs.
Over half (53 per cent) of Conservative MPs agree with the statement that "it has not yet been conclusively proved that climate change is man made".
A further 18 per cent agree that "man-made climate change is environmentalist propaganda".
Climate change has fallen down the political agenda in the past five years, said half of all MPs, compared with 23 per cent who believe the opposite.
However, 68 per cent of all MPs believe more should be done to raise aware of environmental issues.
Greenpeace UK executive director John Sauven described the findings as a "huge embarrassment" for David Cameron in the run-up to the UN climate change summit in New York later this month. "There's virtually no scientific argument left about whether manmade climate change exists, yet two-thirds of Tory MPs are ready to ignore the science in the name of ideology," he said.
"There's no reason for the laws of physics to stop at the right of centre of British politics. Climate change is real and is happening – we’re all going to pay a price for our politicians' failure to take it seriously."
The minister for energy and climate change, Amber Rudd, sought to dispel the impression that the Conservatives are the party of climate change denial.
"Man-made climate change is one of the most serious threats that we face," she said.
"In 1988 Margaret Thatcher, a scientist herself, put climate change firmly on the political agenda in her speech to the Royal Society when she said: ‘It’s we Conservatives who are not merely friends of the earth — we are its guardians and trustees for generations to come… No generation has a freehold on this earth. All we have is a life tenancy — with a full repairing lease.’
"This Government intends to meet the terms of that lease in full."
PRWeek’s examination of the state of the climate change message includes the results of a separate poll of 2,000 members of the public by YouGov.
This found that 80 per cent agree that the climate is changing and 60 per cent think it is the result of human activity.
A third of voters believe concerns about climate change are exaggerated.
PRWeek’s full coverage of the climate change debate can be found on our special report page.