But not as harmful in food chain as previously thought . Initial production phase ` ` by far the most important '' in food chain , says FAO . Food and Agricultural Organization contributes over 33 percent of global impact . Statistics such as the fact that the average American meal travels on average 1,500 miles before it gets to the diner 's plate , have led to stronger backing for `` grow locally '' movements . Meat and dairy contribute 40 percent of ` ` food - related impact ''
But not as harmful in food chain as previously thought . Initial production phase ` ` by far the most important '' in food chain , says FAO . Food and Agricultural Organization contributes over 33 percent of global impact . Meat and dairy contribute 40 percent of ` ` food - related impact ''