Debate will resume in federal parliament on plans to lower the emissions of the country's biggest polluters, despite uncertainty clouding the future of the scheme.
The government 's safeguard mechanism would lead to the biggest 215 polluters forced the cap their emissions, with companies breaching limits forced to buy carbon offsets or trade emissions with other companies.
While debate will continue in the lower house, the mechanism does not yet have support to pass the Senate, with the Greens still not backing the scheme.
