Kiwis would get a $250 annual dividend from a "Kiwi Climate Fund" set-up under a new climate change policy announced by the Green Party today - but farmers will face charges.

Leader James Shaw announced the refreshed climate change policy at a rally in Auckland today.

Several hundred attended, with Booker Prize-winning author Eleanor Catton among those standing at the back of the hall. Minuit performed before Shaw's speech, with comedian Guy Williams the MC.

"Farmers will no longer be exempt from reducing climate pollution," Shaw said, saying new charges under the policy would reduce the average dairy farm's profitability by less than 6 per cent when combined with the party's proposed nitrate levy.

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"Farmers will be able to reduce this cost by planting trees on their land ... no farmer I've talked to wants their child to inherit a world with longer droughts and drier rivers.

"The Greens are the only political party that has spoken the truth - that New Zealand has too many cows. And we've developed a plan to support farmers fix that problem."

The Green Party today took media on a bus trip to launch their transport policy. Video/Dean Purcell

Key changes to the Greens' policy include replacing the Emissions Trading Scheme (ETS) with a Kiwi Climate Fund that will charge polluters more.

That money will provide a guaranteed payment to people who plant trees and recycle remaining revenue to an annual dividend to all Kiwis aged 18 and older, expected to be about $250 per person in 2020.

The Greens want to pass a Zero Carbon Act in its first 100 days in government to bind all future governments to the goal of net zero emissions by 2050.

An Independent Climate Commission would be established to advise on climate targets as well as emissions prices.

The Greens said initial charges in the Kiwi Climate Fund by 2020 are expected to be:
• $40 per tonne of carbon dioxide emissions.

• $6 per tonne of nitrous oxide emissions from agriculture.

• $3 per tonne of methane emissions from agriculture.

• $40 guaranteed payment for each tonne of carbon sequestered by planting trees.

The previous climate change policy had only included the dairying sector, and now captures all agriculture sectors. The party said it expected charges on dairy pollution to be about the same under the new policy, after a nitrogen levy is factored in.

Previously the Greens had called for an initial price on carbon of $25 per tonne on CO2 equivalent emissions for all sectors except agriculture, which would pay $12.50.

Shaw said a proper price on pollution will raise the living expenses of an average household by about $90-100 a year. That would be more than offset by a reduction to the bottom tax rate and the annual dividend, he said.

"TEETH-GRINDING POLLS"

Climate change is the party's most important policy area and today's launch is a chance to convince voters concerned about climate change that the Greens are most committed to change.

Jacinda Ardern has focussed on environmental issues since taking over as Labour leader leader, calling climate change "our generation's nuclear-free moment" and launching Labour's own policy just two days ago.

Labour has surged in the polls with the Green Party dropping to just above the 5 per cent threshold needed to return to Parliament.

Today, Shaw said current polls - which "sometimes make my teeth grind" - showed the question now was not whether Labour will win, but who they will invite into government with them.

"If you...don't want Winston Peters holding Labour over a barrel, I am asking you to give your party vote to the Greens...[for] the most environmentally friendly, most progressive government in generations."

Shaw likened the fight against climate change to the push to land a man on the moon, quoting former US president John F Kennedy.

"That goal will serve to organise and measure the best of our energy and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win."

Like Ardern, Shaw also likened action on climate change to New Zealand's past stance against nukes, saying "we need to honour that legacy and live that tradition".

Other aspects on today's climate change policy include providing forestry payments and a $40m grant for native planting to support the planting of 1.2 billion trees on 1.1m hectares of erosion-prone land, and setting up funds to promote "green" investment and sustainable farming.

The Greens want to reach 100 per cent renewable electricity generation by 2030, stop new coal mines, fracking and deep-sea drilling, and create a humanitarian visa for Pacific Islanders displaced by climate change.

LABOUR POLICY

The Labour Party on Friday released its climate change policy, which includes a new goal of net zero carbon emissions by 2050.

Labour leader Jacinda Ardern also said all sectors including farmers would have to pay for their emissions within her first term, though their costs would initially be offset.

Labour has always planned to include agriculture in the Emissions Trading Scheme, but that was the first time Ardern has set a deadline for their inclusion.

The party previously had a goal of reducing emissions by 40 per cent from 1990 levels by 2030.

As previously announced, Labour would make legally binding emissions reductions targets and would set up a new government agency to oversee the work.

The Green Party has announced a plan it says will make NZ the first country to get rid of the gender pay gap. Employers would be required to reveal the gap between women's and men's pay under a Green government. NZN VIDEO/Daniel Hicks

NATIONAL POLICY

New Zealand's net emissions have risen 64 per cent since 1990.

National has set a target of reducing emissions to 11 per cent below 1990 levels - a goal which is locked into the Paris Agreement on climate change.

National aims to reach the target by buying carbon credits, reducing transport emissions and investing in research to reduce agricultural emissions. It opposes putting agriculture into the ETS.