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  • Carbon budgets have become a prominent tool in guiding climate policy.

  • Carbon budgets estimate the remaining amount of CO2 that may be emitted whilst holding temperature rise to a given level.

  • There are significant physical uncertainties and value based assumptions that must be resolved in order to assign national level carbon budgets.

  • A wide range of budgets could be argued as consistent with the Paris agreement, based on how the agreement is interpreted, and how uncertainties are addressed.

  • These uncertainties present a call to action to increase the ambition, scale and pace of national emissions reductions to achieve maximum possible emissions reductions year on year, to minimise the UK’s cumulative contribution to climate breakdown.


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