Section 3 is amended by repealing subsection (1) and substituting the following subsections:
“(1) The purpose of this Act is to—
“(a) enable New Zealand to meet its international obligations under the Convention and the Protocol, including (but not limited to)—
“(i) its obligation under Article 3.1 of the Protocol to retire Kyoto units equal to the number of tonnes of carbon dioxide equivalent of human-induced greenhouse gases emitted from the sources listed in Annex A of the Protocol in New Zealand in the first commitment period; and
“(ii) its obligation to report to the Conference of the Parties via the Secretariat under Article 7 of the Protocol and Article 12 of the Convention:
“(b) provide for the implementation, operation, and administration of a greenhouse gas emissions trading scheme in New Zealand that supports and encourages global efforts to reduce greenhouse gas emissions by assisting New Zealand to meet its international obligations under the Convention and the Protocol, and by reducing New Zealand's net emissions below business-as-usual levels.
“(2) For the purposes of this section, business-as-usual levels means the levels of New Zealand's greenhouse gas emissions, estimated by a Minister or chief executive with powers or functions under this Act at any particular point in time, as if the greenhouse gas emissions trading scheme provided for under this Act had not been implemented.”