Estimates for the food sector’s contribution to global carbon dioxide (CO2) emissions range from a fifth to about a third.

Our World in Data has the number at 26%. We don’t think about it that often, but growing, making, transporting, packaging, selling and cooking food is unbelievably energy intensive. The emissions come from livestock and fisheries (31% of total), crop production (27%), land use (24%) and the supply chain (18%).