Table 6. Weighting factors for categories of environmental impact.

Category	Relative impact of meat protein production a	Relative impact of plant protein production	(Dog + Cat)/Human
Land Use	6–17	1	26%–29%
Water	4–26	1	25%–30%
Fossil Fuel	6–20	1	26%–30%
Phosphate	7	1	27% ± 5% b
Biocides	6	1	26% ± 5% b

^a from Reijnders and Soret [6].

^b [6] does not report a range in impacts for these variables, variability is calculated using uncertainty in dog and cat meat/energy consumption