​Alberta's environment minister says debate around climate change has become too polarized, and that uncertainty on action will discourage investment.

Speaking to a full house at the Pembina Climate Summit in Calgary Tuesday, Shannon Phillips said the debate in the oil and gas industry has already shifted to how best to tackle climate change — but that the political right in Alberta continues to preach inaction.

"As we move back into the legislature, you will all hear again and again that this is not the right time for action. For some there will never be a right time," said Phillips.

She said the NDP is pushing ahead with its ambitious environmental agenda, despite strong push back from opposition members who say the plan is too costly for Albertans.

"We are doing all of this in a highly polarized political environment, where the political right in this province can barely conceal their contempt for Premier [Rachel] Notley and her government," said Phillips.

The Wildrose party has argued that the climate plan is discouraging investment in Alberta and will hinder the province's ability to recover from the downturn.

Phillips, however, said that oil and gas companies and potential international investors have told her that they want to see action on climate change.

"It is of key importance for Alberta, for investment confidence in the oil and gas sector, to have a robust and credible climate plan," she said.

"It is no longer a safe investment bet to be able to make the case for large-scale investment, which is what we require in Alberta, without a climate plan. So it's an economic dead end."

Phillips's speech comes as the province moves ahead with an ambitious agenda including phasing out coal-fired power plants, capping oilsands emissions and introducing a carbon tax.

The Wildrose party has said that those policies have led to Alberta losing investments to Saskatchewan, which has no carbon tax.

That could soon change though, with the federal government committing earlier this week to level the playing field somewhat by imposing a carbon price on any province that doesn't adopt their own carbon pricing mechanism.