Limitations of scenario modelling
The Agribusiness and Economics Research Unit (AERU) at Lincoln University was commissioned to prepare a situational analysis of New Zealand’s bioeconomy, which looked at the current uses of New Zealand’s biological resources and examined 6 land use change and export premium scenarios.
The scenarios were developed to examine the land use, community, and environmental impacts of following specific pathways to meet bioeconomy and economic targets. For a number of these scenarios, the level of land use change (and associated community and environmental impacts) would rule them out as feasible pathways to support New Zealand’s transition to a bioeconomy.
The modelling frame employed by the AERU measures the economic, social, and environmental consequences of land use change but should be seen primarily as a high-level assessment tool.
More granular tools would be required to fully assess the implications associated with each of the scenarios, from the capital investment required to grow dairy production, through to the research and marketing development required to build export premiums, and the detailed energy analysis needed to assess the biomass requirements to meet the expected primary and final energy supply requirements.
The AERU modelling had limited ability to incorporate off-setting actions (such as integrating forestry more fully into farming operations), or how improvements in livestock and land use productivity would affect the scenario outcomes.
With high-level modelling of this nature the results are assessed against the status quo, rather than against a range of feasible land use and production alternatives. This limits the opportunity to assess alternative pathways, which may have lower environmental costs or offer higher economic returns. (Such as the utilisation of new forest production for engineered timber in construction rather than biomass for energy.)