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732 LEGISLATION AND PUBLIC POLICY [Vol. 24:725
the United States, agricultural soil management practices—such as the
production and usage of fertilizers—also lead to significant GHG
emissions in the form of nitrous oxide.
23
The need to grow crops to
feed animals raised for human consumption leads some people to call
animals “inefficient food converters” because humans could instead
eat the crops directly.
24
Beyond land management, livestock them-
selves produce emissions.
25
Cattle release methane when they belch
due to their digestive process of enteric fermentation;
26
manure also
emits methane and nitrous oxide.
27
In fact, in the United States, “56
percent of total [CO
2
e] emissions from the agricultural sector” come
from livestock.
28
Meat and dairy are the greatest culprits.
29
Encapsu-
lating the contributions of cows to climate change, Jeremy Coller,
www.ucsusa.org/resources/tropical-deforestation-and-global-warming (last updated
Nov. 10, 2021) [https://perma.cc/94CJ-3HRS].
23.
I
NVENTORY
, supra note 1, at 2-21 & 2-22.
24. Feed-to-Meat – Conversion Inefficiency Ratios,
A W
ELL
-F
ED
W
ORLD
,
https://
awellfedworld.org/feed-ratios/ (last visited Feb. 15, 2022) [https://perma.cc/RVJ7-
NY65]. See also Jillian P Fry, Nicholas Mailloux, David Love, Michael Milli & Ling
Cao, Feed Conversion Efficiency in Aquaculture: Do We Measure It Correctly?, 13
E
NV
’
T
R
SCH
. L
ETTER
024017 (2018), https://iopscience.iop.org/article/10.1088/1748-
9326/aaa273/meta (stating that Feed Conversion Ratios (FCRs) “are typically
6.0–10.0 for beef” compared to “1.7–2.0 for chicken”); Id. (using the common mea-
surement of Feed Conversion Ratios, “fed aquaculture and chickens are similarly effi-
cient at converting feed into animal biomass, and both are more efficient compared to
pigs and cattle”). According to the World Resources Institute, “[p]roducing beef, for
example, uses 20 times the land and emits 20 times the emissions as producing beans,
per gram of protein” Richard Waite & Daniel Vennard, Without Changing Diets, Ag-
riculture Alone Could Produce Enough Emissions to Surpass 1.5
°
C of Global Warm-
ing,
W
ORLD
R
ES
. I
NST
.
(Oct. 17, 2018), https://www.wri.org/insights/without-
changing-diets-agriculture-alone-could-produce-enough-emissions-surpass-15degc.
See also Gidon Eshel, Alon Shepon, Tamar Makov & Ron Milo, Land, Irrigation
Water, Greenhouse Gas, and Reactive Nitrogen Burdens of Meat, Eggs, and Dairy
Production in The United States, 111
P
ROC
. N
AT
’
L
A
CAD
. S
CI
.
11996, 11998 (2014),
https://www.pnas.org/content/111/33/11996 (“beef is consistently the least resource-
efficient of the five animal categories [which are beef, dairy, poultry, pork, and eggs]
in all four considered metrics [which are land, water, GHGs, reactive nitrogen]”).
25. Feed-to-Meat
– Conversion Inefficiency Ratios, supra
note 24.
26.
Livestock, and especially ruminant livestock such as cows, produce methane
during digestion, which results in “over a quarter of the emissions from the agricul-
tural economic sector.” Sources of Greenhouse Gas Emissions,
E
NV
’
T
P
ROT
. A
GENCY
,
https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions (last visited
Feb. 15, 2022) [https://perma.cc/CL69-798T].
27.
According to the EPA, “[m]anure management accounts for about 12 percent of
the total greenhouse gas emissions from the Agriculture economic sector in the United
States.” Id. When methane emissions from enteric fermentation and manure manage-
ment are aggregated, agriculture is the largest source of methane emissions in the
U.S., surpassing natural gas and oil production. Id.
28.
Livestock includes beef cattle, dairy cattle, swine, horses, mules, goats, sheep,
bison, and poultry. The majority of emissions are from beef cattle, followed by dairy
cattle and then swine.
U.S. D
EP
’
TOF
A
GRIC
., U.S. A
GRICULTURE AND
F
ORESTRY