The energy modelling community’s analysis of net zero often relies on approaches that hide the extent of uncertainty. Meanwhile the extent of uncertainty involved in the realisation of net zero is proliferating. Conventional consolidative modelling approaches lack of transparency is distorting decision making and policy design around net zero. This contribution uses the UK’s Committee on Climate Changes 6th Carbon Budget as a case study. An exploratory, Robust Decision-Making approach is used to highlight the fragility of conventional UK modelling approaches in shaping national climate policy. A new suite of tools, orientation of analysis and mixed approaches are needed to address the extent of complexity, uncertainty and emergence in possible net zero futures. Only then will robust, inclusive and realisable climate policy be designed.