Climate change mitigation data in Aotearoa is hosted by a range of organisations and collected using different frameworks and methodologies. Main collated data sources are the GHG emissions account and the GHG emissions inventory. Sector specific data are available through relevant government agencies.

A stock-take of New Zealand’s modelling capacity identified 84 climate change or climate change mitigation models: 13 multi-sector models, 23 land use and agricultural models, 25 energy models, and 23 transport models. The stock-take identified at least one model for each sector of the first Emissions Reduction Plan for Aotearoa - except for Building and Construction. Modelling capacity varied between sectors. The more developed sectors demonstrate greater interdependency between models. Almost all modelling takes a production-based approach. Capacity for a consumption-based approach was much more limited.

Collaboration on modelling between different government agencies allows for greater coordination (for example of key assumptions), facilitates interdependencies between models through sharing of data and information, and avoids duplication. A collaborative approach helps build capacity within the modelling community through learning opportunities and peer review. The authors identified two examples of formal collaboration. They found no formal international collaboration (outside of international reporting requirements).