In an unusual move National is putting a minister outside of Cabinet, United Future leader Peter Dunne, in charge of a special select committee being set up to consider climate change.
The National government has put the emissions trading scheme (ETS) on hold while it conducts a complete review.
The review is part of ACT's support agreement with National and the support partner wants it to consider reviewing the science stating humans are to blame for climate change. However, the Government has said it is unlikely to be that sweeping.
ACT campaigned on scrapping the ETS and has questioned whether human-induced climate change actually exists.
National campaigned on watering down the existing legislation within nine months.
Speaking at the post-Cabinet press conference, Prime Minister John Key said talks were continuing about the make-up of the committee but Mr Dunne had been chosen to chair it.
Mr Dunne is a minister outside Cabinet as part of his support arrangement with National.
It is an unusual appointment as ministers do not usually sit on committees involving legislation. Mr Dunne is Revenue Minister and Associate Health Minister.
Green Party co-leader Russel Norman said he hoped Mr Dunne, as Revenue Minister, would consider the impacts of changes to the ETS on taxpayers.