The Greens will hold the first of three scheduled partyroom meetings this week to determine their position on the government's emissions reduction legislation.
The government is pushing ahead to legislate its target of 43 per cent emissions reduction by 2030, with a vote in the lower house expected this week.
Greens leader Adam Bandt is heading negotiations with Climate Change Minister Chris Bowen but will need to run any final concessions by his party room for approval.
Whether the Greens will seek to move amendments in the lower house, where Mr Bandt sits, or the Senate, where they hold the balance of power, is also under discussion.
There remains the chance a vote on the bill could be postponed until the next sitting period in September if negotiations remain ongoing or the Greens fail to reach a consensus.
Mr Bandt says there remains a range of views in his party room.
"One of the good things about our Greens party room is that we have those robust discussions and we have them internally and then we come to a consensus position," he told Sky News.
"The party room will ultimately get the say about how we vote in the (lower) house and how we vote in the Senate.
"But as you'd expect, there is a range of views."
The Greens are pushing for an increase to the 43 per cent target and a moratorium on new coal and gas projects, both of which Labor remains steadfastly against.
The bill is not expected to come before the Senate before the next sitting period in October.
The government will also need to convince either independents David Pocock, Jacqui Lambie, Pauline Hanson or United Australia Party's Ralph Babet to vote for the legislation alongside the Greens in the Senate for it to pass.
However, Liberal senator Andrew Bragg has been coy on whether he would cross the floor to vote for Labor's bill given his push for stronger climate action.
Mr Bowen remains adamant the government doesn't need the legislation to push ahead with its emissions reduction agenda and will do so if it doesn't pass parliament.
