The government's signature climate legislation is on the verge of passing the Senate after it sat late into the night.
The bill will enshrine Labor's 43 per cent emissions reduction by 2030 and net-zero by 2050 targets in law, and has garnered support from the Greens and key crossbenchers despite calls for it to go further.
Senators sat late into Wednesday night for the bill's second reading, with amendments due to be moved on Thursday, clearing the way for it to be voted on.
Some amendments moved by independent senator David Pocock and the Jacqui Lambie Network will strengthen some reporting requirements for the responsible minister under the bill and will likely pass with the support of the government.
The bill, if amended, will be sent back to the House of Representatives where it passed at the start of August.
The Greens are also calling for the government to heed the bill's passing to stop the expansion of a coal mine in NSW.
"It will become law and this is happening at the exact same time as Environment Minister Tanya Plibersek has on her desk a request for the biggest expansion of a coal mine in NSW since Australia signed the Paris Agreement," Senator Sarah Hanson-Young said.
"Don't make a mockery of your new laws on day one. Send a message to the industry, to the market and to the Australian people you're serious about cutting pollution."
A key element of achieving the emissions cuts - changing the safeguard mechanism to lower emissions for more than 200 of the country's biggest polluters - is currently out for public comment.
The government is also seeking to introduce more renewable energy and make electric vehicles cheaper.
© AAP 2022