National Environmental Standard for greenhouse gases?

Details of the request

Section 70B of the RMA 1991 provides as follows:

70B Implementation of national environmental standards
If a national environmental standard is made to control the effects on climate change of the discharge into air of greenhouse gases, a regional council may make rules that are necessary to implement the standard, provided the rules are no more or less restrictive than the standard.

Could you please provide all documents relating to the development of a national environmental standard under this provision.