Federal Liberal MP Dennis Jensen says the cause of climate change is still in dispute and has attacked environmentalists as "anti-democratic alarmists".

Dr Jensen, who has spoken out previously on the issue, has also called for the Intergovernmental Panel on Climate Change (IPCC) to be disbanded.

His comments come as the Coalition struggles with internal division on climate change policy.

In a speech to open the Australian Environment Foundation's annual conference in Canberra today, Dr Jensen said the question of whether climate change was caused by human activity was still up for debate.

"It will come as no surprise that I am sceptical on the anthropogenic component of climate change," he said.

"Climate change is real - the liability of humans in questionable."

Dr Jensen criticised the climate change science and accused the environmental movement of wanting to overthrow democracy.

"While the gap between climate observations and model projection outputs continue to diverge, the ardour and shrill character of the alarmists increases," he said.

Dr Jensen's attack comes as the Coalition begins negotiations with the Government over its emissions trading scheme, an issue which has threatened Malcolm Turnbull's leadership in recent weeks.

On Sunday Mr Turnbull won the support of the party room to push for changes to the scheme but Dr Jensen has lashed out at the use of emissions trading schemes.

"Another reason for my concern is that embarking on setting a price on carbon dioxide is effectively putting a tax on everything and will give the control freaks a level of control on all human enterprise within a nation not seen in democratic history," he said.

Dr Jensen is one of several Western Australian MPs who have urged the Coalition to reject an emissions trading scheme.

The Australian Environment Foundation's website has a link to a petition which opposes the Government's scheme.