Wu, S., L.J. Mickley, D.J. Jacob, J.A. Logan, R.M. Yantosca, and D. Rind, 2007: Why are there large differences between models in global budgets of tropospheric ozone? (pubs.giss.nasa.gov)
Australia's total coal resources equals 300GtCO2, so applying a conservative estimate that only 50 % will of this will be proven (150GtCO2) reveals total holdings that take up 75 % of the precautionary, lower limit global budget for coal. (carbontracker.org)
The standard methodology in the climate world is to estimate a remaining global budget (which is hard) and then to work out the share of this budget that properly belongs to each country (which is harder). (ecoequity.org)