Bay of Plenty MP Todd Muller says he is looking forward to his new portfolio as part of the Opposition in Parliament.
National Party leader Bill English revealed his new lineup, promoting Muller to spokesman for climate change and Maori and Crown relations.
Tauranga MP Simon Bridges has picked up the crucial task of being the party's spokesman on immigration as well as economic and regional development.
Muller said the new role would be significantly challenging, as "these are particularly chunky portfolios".
Muller said he was passionate about climate change and was prepared for the sceptics.
"I'll certainly do a lot of listening. That's always been my approach - listen first and have the different perspectives people have in mind before making any decisions.
"Climate change globally is very real. There are already significant changes with businesses and communities to become less carbon intensive. Those transitions are already under way."
However, Muller said the trick to making such changes successful was to ensure they were still profitable. New Zealand also needed to ensure it met its international climate change obligations. Both were going to be key areas of focus as Muller settled into the role.
"You can see the obvious need to change in the way that sees New Zealand deliver its targets, but also in the way the Government brings the country and community with it.
"I think it will be significantly challenging."
Muller said he was also looking forward to liaising with the Crown and iwi.
"I have seen first-hand in my previous roles with Zespri and Fonterra the benefits of post-settlement iwi becoming more productive. We've had fantastic examples of this in the Bay of Plenty."
Bridges said his new portfolios would see him go head-to-head with David Parker (Minister for Economic Development), Shane Jones (Minister for Regional Development), Ian Lees-Galloway (Minister for Immigration) and Chris Hipkins (Leader of the House).
Bridges has also been confirmed as shadow Leader of the House. He said this role would likely mean more work than the others put together, though it was not a role well understood in public.
"It is a critical strategic and tactical role for the Opposition that has me leading our approach across Parliament. It will be an intense job in Opposition.
In the house, he will police the debate, trying to make sure the rules were followed to National's advantage and that the party was "getting a fair go".
"Basically that means standing up and making a lot of points of order."