In 2015, food-system emissions amounted to 18 Gt CO2 equivalent per year globally, representing 34% of total GHG emissions. The largest contribution came from agriculture and land use/land-use change activities (71%), with the remaining were from supply chain activities: retail, transport, consumption, fuel production, waste management, industrial processes and packaging.
Food = total GHG emissions * 0.34
Agriculture = Food * 0.71
(supply chain activities: retail, transport, consumption, fuel production, waste management, industrial processes and packaging) = Food * 0.29
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I know how to: .71 * 18 = 12.78 Gt, which is more than double what your graph ascribes to agriculture.
Also, there’s no need to be rude, even if I had been wrong.