Agriculture emits GHG in its processes to produce food.
A Few Details
Agriculture emits GHG in different ways:
-Burning gas for tractors and machinery.
-Releasing methane gas from organic decomposition of waste and byproducts. (Methane comes from agriculture for 2/3 and from oil and coal corporations (in the category of industries) for 1/3.)
-Use of fertilizers (and tilling) are linked to GHG emissions from microbial activity.