The Greens will hold another meeting to make a decision on the minor party's final stance on the federal government's climate bill.
The party did not come to an agreement on the issue on Tuesday morning, forcing a second meeting to be called for Tuesday night.
Labor's bill, which will enshrine an emissions reduction target of 43 per cent by 2030 and net zero by 2050, needs the support of all 12 Greens MPs plus one crossbencher to pass the Senate.
Negotiations between Greens leader Adam Bandt and Climate Change Minister Chris Bowen have been ongoing, after the Greens expressed concerns with the bill.
The Greens have called for more ambitious climate targets and for an end to coal and gas projects.
Greens MPs have previously described the climate bill as "pathetic".
Tuesday night's meeting will go on for as long as necessary to reach a final decision.
While the party will aim for consensus, if that doesn't happen a party room vote will take place.
The bill is due to be debated in the House of Representatives later on Tuesday.
A Labor caucus meeting was told the bill was expected to clear the lower house this week.
Meanwhile, the coalition will also soon decide whether to block or support the government's bill.
Opposition Leader Peter Dutton, who addressed a joint parties meeting in Canberra on Tuesday, has previously said he doesn't support it.
But a number of Liberal MPs are considering crossing the floor to back Labor's bill.
Liberal MP Warren Entsch said he had an "open mind".
"I'm not concerned about the number, I just want to be convinced there's an absolute pathway to do it," he told Guardian Australia.
Liberal senator Andrew Bragg has previously said he was considering crossing the floor.
Independent MP Allegra Spender, who ousted moderate Liberal Dave Sharma from the eastern Sydney seat of Wentworth on the back of a climate action campaign, said she would "absolutely" vote for the bill.
"Business is asking for certainty ... so that they can make the investments they need to get carbon out of our economy," she told Sky News.
"I will absolutely support that legislation, but I want the government to go further and I'll be pushing them to take greater policy action there."
The legislation has been sent to a Senate committee, which is due to report on August 31.
