PATHWAYS TO NET-ZERO
According to the IPCC, the remaining budget to limit global warming to 1.5ºC with a 50% probability is about 500 GT of CO 2 (IPCC, 2021). In top-down scenarios, annual CO 2 emissions are halved by around 2030 and reach net-zero by mid-century. Non-CO 2 GHGs such as nitrous oxide (N 2 O) and methane (CH 4
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