IIRC the actual level of change we need to achieve long-term stability is something like 99%-99.9% reduction (depending on the gas, CH4 != CO2). If so, we’d have to eliminate about half of shipping emissions even if we eliminated 100% of the emissions in every other sector, but that’s even worse for your argument as it also means we have to eliminate 5/6ths of all livestock & manure emissions if we eliminated 100% of everything else.
According to this, livestock & manure are 5.8% of the total, while shipping is 1.7% of the total: https://ourworldindata.org/emissions-by-sector
IIRC the actual level of change we need to achieve long-term stability is something like 99%-99.9% reduction (depending on the gas, CH4 != CO2). If so, we’d have to eliminate about half of shipping emissions even if we eliminated 100% of the emissions in every other sector, but that’s even worse for your argument as it also means we have to eliminate 5/6ths of all livestock & manure emissions if we eliminated 100% of everything else.