The carbon foodprint of 5 diets compared – shrinkthatfootprint.com
More recent studies show that food system emissions could account for as much as quarter of all human emissions. That is 12% from agricultural production, another 9% from farming induced deforestation, and a further 3% from things like refrigeration and freight.
Tue May 31 12:06:26 2016 - permalink -
But perhaps most interestingly, eating chicken instead of beef cuts a quarter of emissions in one simple step.
Each of these estimates includes emissions from food that is eaten, wasted by consumers and lost in the supply chain.
In the average diet animal products make up 60% of emissions despite accounting for just a quarter of food energy.
variations of the average American diet based on data from the USDA’s Economic Research Service.
Using food groups also hides great variation of carbon intensity within each group. A hot housed tomato can have emissions 5 times higher than one grown in season, potatoes have tiny footprints compared to many other vegetables, and cheese has much higher emission than milk. So by limiting ourselves to just nine food groups we greatly understate the potential that changing diet has to reduce food emissions.