Both major parties have talked up their climate change credentials after an opinion poll found almost 60 per cent of NSW voters will be swayed by the issue when casting their ballot at the state election.

Some 57.5 per cent of respondents said they would focus on the issue when voting on March 23, according to a UComms/ReachTEL poll published in The Sydney Morning Herald.

NSW Premier Gladys Berejiklian on Tuesday said “of course” she believed in climate change and she had made that clear “on a million occasions”.

“We’ve had a very consistent position since we’ve been in government that climate change is real and as a government we need to do everything we can to deal with it – and we have been,” the Liberal leader told reporters in Sydney.

Ms Berejiklian said her party tried to balance renewable projects with reducing electricity prices for households.

Opposition Leader Michael Daley on Tuesday said he wasn’t surprised by the poll and vowed a Labor government would have a climate change minister at Macquarie Street.

He said the issue had been on his agenda since his first speech in parliament in 2005.

“We believe in climate change, we believe it’s real, the coalition don’t,” Mr Daley told reporters.

“They still think it’s funny that Scott Morrison walked into parliament with a lump of coal. I don’t think that’s funny. I think it’s a lack of leadership.”

The UComms/ReachTEL poll of 1019 voters taken on Thursday suggested Labor was leading the coalition 51 per cent to 49 per cent on a two-party preferred basis.

Elsewhere, a Newspoll published in The Australian on Tuesday suggests the election could result in a minority government in NSW for the first time in almost a quarter of a century.

The poll of 1003 voters, taken between Friday and Monday, found the coalition and Labor were deadlocked on 50 per cent on a two-party preferred basis.