Professor Barry McMullin:

I will be as brief as I can. Net zero at best is about stabilising temperature and we have had the discussion that stabilisation is not enough, so I do not disagree with the Senator that improving or clarifying that net zero by 2050 would be useful. Calibrating our effort against the global temperature goal is essential. That is the only way we know whether our efforts are commensurate with the absolute temperature rise, so it is really important we do that as well.