Legislative, 2002: Climate Change Response Act
- implemented an ETS which covers all sectors and all gases, covers about 50% of emissions, ETS covers about only 50% of all emissions (ETS tracker)

Amended in 2023: Climate Change Response (Late Payment Penalties and Industrial Allocation) Amendment Act 2023
"This Act amends the Climate Change Response Act 2002, in particular the allocation of emissions units under the emissions trading scheme. The Act amends the notice period for a failure to repay or surrender units under the scheme the Environmental Protection Agency is obliged to provide, as well as the calculation for determining the penalty for liability under the 2002 Act. The Act contains further amendments on costs for penalties under the 2002 Act, and further amends sections of the Acts on industrial allocations, including section 84, adjusting the validated allocation of trading units based on projected data" (Source: Climate Laws)