Zebedee Nicholls

PhD Researcher at the Climate & Energy College, University of Melbourne

Zebedee Nicholls is a PhD Researcher at the University of Melbourne's Climate & Energy College. He leads the Reduced Complexity Model Intercomparison Project (RCMIP, see and is a contributing author to the Working Group 1 contribution to the IPCC's Sixth Assessment Report. His work has focussed on the development and evaluation of reduced-complexity climate models, particularly those used for evaluating the climate implications of different emissions scenarios. He is also interested in the remaining carbon budget, particularly the implications of different choices about how to calculate it and making output from complex climate models easier to work with (see To facilitate this work and enhance reproducibility, he is committed to developing open-source scientific software and contributes to a number of projects (see and


  • 2016–present
    PhD Researcher, University of Melbourne


  • 2016 
    University of Oxford, Masters of Physics


  • 2020
    The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500, Geoscientific Model Development
  • 2020
    Implications of non-linearities between cumulative CO2 emissions and CO2-induced warming for assessing the remaining carbon budget, Environmental Research Letters
  • 2019
    A new scenario logic for the Paris Agreement long-term temperature goal, Nature
  • 2018
    Cloud, precipitation and radiation responses to large perturbations in global dimethyl sulfide, Atmospheric Chemistry and Physics
  • 2017
    A modified impulse-response representation of the global near-surface air temperature and atmospheric concentration response to carbon dioxide emissions, Atmospheric Chemistry and Physics