The Climate Change Response Act 2002 is a broad framework law, but it is also a practical compliance law. At the national level, it covers the 2050 target, emissions budgets, emissions reduction planning, the Climate Change Commission, climate risk assessment and adaptation planning.
For many businesses, the more immediate part is the New Zealand Emissions Trading Scheme. The Act sets up the registry system, participant rules, monitoring and return obligations, allocation rules, EPA powers, review and appeal rights, and offences and penalties.
That means a business should not treat this Act as policy-only. If your operations fall within the ETS parts, the Act can create direct filing, record-keeping, account, unit and governance obligations.