Climate scientist James Renwick says the window for action is closing fast.
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They say that while the need for action to lower emissions and tackle climate change has never been greater, they doubt the government will step up.
It is being pitched as a Covid-19 recovery budget, as the world starts to emerge from 16 months focussed on battling the virus.
Victoria University climate scientist James Renwick said the window for climate action was closing fast.
"Forget 10 years to sort emissions it's really only 18 months.
"It's this period last year and this year where governments are making investments, we've got to get that right - the pressure is on."