Eggs The environmental indicator values for eggs are taken from published sources and are given in the tables below.
Table 5.1.65 – Ecological Footprint assessment for 1 kg of eggs
Cropland
Table 5.1.62 – Indicators for 1 kg of eggs
Carbon Footprint
Water Footprint
Ecological Footprint
gCO2-eq/kg
liters/kg
global m2/kg
Data range
4,038 – 5,800
3,300
9
Average value
4,813
3,300
9
Cooking (boiling)
420
Negligible
5
Average value with cooking
5,233
3,300
14
EGG
Ecological Footprint
Energy land
Land use [m2/kg]
Equivalence factor [global m2/m2]
Crop land [global m2/ kg]
CO2 emissions [gCO2/kg]
Equivalence factor [gha/tCO2]
Energy land [global m2/ kg]
global m2/kg
2.516
2.64
6.6
80017
0.277
2.22
8.88
Table 5.1.66 – Ecological Footprint for 1 kg of eggs
Ecological Footptint Product
Source global m2/kg
NUMBER AND TYPE OF SOURCES UTILIZED
Eggs
Source Type
LCA Data Banks
Certified publications
Scientific publications
Generated in-house
Carbon Footprint
-
2
-
-
Water Footprint
1
-
-
-
Ecological Footprint
-
-
-
1
Table 5.1.63 – Carbon Footprint for 1 kg of eggs
Product
9
Elaborated by the working group
Food from fishing The indicators calculated for this category are given in Table 5.1.67. The average of the values found in the literature (for the Carbon Footprint) was calculated taking into consideration the retail sales data and excluding, respectively, data for mussels and lobster because of their extreme variation. Table 5.1.67 – Indicators for 1 kg of fish
Carbon Footprint gCO2-eq/kg
Water Footprint
Ecological Footprint
gCO2-eq/kg
liters/kg
global m2/kg
Data range
220 – 10,500
N.A.
45 - 66
Average value
3,273
N.A.
56
Cooking (broiling)
1,000
Negligible
13
Average value with cooking
4,273
N.A.
69
FISH
Organic eggs
4,038
Dekker et al.
Organic eggs
5,80014
Williams et al.
Non-organic eggs
4,60015
Williams et al.
Table 5.1.64 – Water Footprint for 1 kg of eggs
Water Footprint Product
Carbon Footprint
Source
Source liters/kg
Eggs
3,333
www.waterfootprint.org
Calculations for the Ecological Footprint were made exclusively on the basis of Cropland and Energy Land contributions, as shown in the tables below.
14 This value was elaborated per kg of eggs produced; the study by Williams provides an emission value of CO2 equivalent for 20,000 eggs equal to 7,000 kg. The weight of each egg was assumed to be 60 grams (http://www. waterfootprint.org/?page=files/productgallery&product=eggs) 15 This value was elaborated per kg of eggs produced; the study by Williams provides an emission value of CO2 equivalent for 20,000 eggs equal to 5,530 kg. The weight of each egg was assumed to be 60 grams (http://www. waterfootprint.org/?page=files/productgallery&product=eggs)
94 - Double Pyramid: healthy food for people, sustainable food for the planet
16 Calculated taking into consideration that approx. 2 kg of corn per kg of eggs are required and that corn yield is 8 t/ha 17 Dekker et al.
5. Details of environmental data gathered - 95