A Green Euro-MP yesterday linked denial of the Holocaust and contradiction of the belief that global warming is a man-made problem.
Caroline Lucas hit out after a poll showed a majority of Britons believed there were still significant doubts among scientists about the causes of climate change.
She blamed the media for a "worrying" level of public scepticism in the face of evidence that human activity was responsible, and went on: "The media's attempt to seem balanced is in fact distorting the public's understanding of perhaps the most pressing issue facing us all today – and it's tragic.
"Would the media insist on having a Holocaust-denier to balance any report about the Second Word War?
"Of course not – but by insisting on giving so much airtime to climate change deniers, it is doing exactly the same thing."
Ms Lucas is MEP for South East England and a member of the European Parliament's Environment and Climate Change committees.
In another development, ascientist has claimed climate change could be caused by natural conditions as well as humans after finding ancient DNA in Greenland which indicates the region was much warmer during the Ice Age than previously thought.
Martin Sharp, of the University of Alberta, Canada, took part in an international research project which collected the oldest ever-recorded DNA samples.
He had previously supported the idea that global warming was caused by humans but the project raised doubts, according to an article in the Science journal.
The DNA was discovered at the bottom of a 2km-thick ice sheet and came from trees, plants and insects of a forest estimated to be up to 900,000 years old. Ice underneath the glacier had preserved the samples.
They suggest the temperature of the southern Greenland forests at the time was probably between 10C in summer and -17C in winter.