Inadequate methane reductions deplete remaining carbon budgets for 1.5 °C and 2 °C targets, jeopardizing Paris Agreement goals. This study reveals the non-CO2 emissions assumptions in IPCC's latest budget estimates, assessing impacts from methane, nitrous oxide, fluorinated gases, and aerosols. Alternative emission scenarios show current budgets are exhausted immediately.
Substantial reductions in non-CO2 greenhouse gas emissions reductions implied by IPCC estimates of the remaining carbon budget
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