Green house gas(GHG)emission per unit livestock product 130 110 90 70 50 30 10 Ages of sheep GHG (kg COze) Product Per kg product Per MJ human-edible product Per kg human-edible protein Milk 1 0.37 28.6 Meat Poultry 2.7 0.40 18.4 Pig 3.9 0.30 34.2 Beef 13 1.40 93.5 Sheep 13 1.51 92.9 COze=carbon dioxide equivalents.Green house gas (GHG) emission per unit livestock product Ages of sheep