Pets
have a considerable environmental impact, especially in countries where they
are common or held in high densities. For instance, the 163 million dogs and cats
kept in the United States consume about 20% of the amount of dietary energy
that humans do and an estimated 33% of the animal-derived energy. They produce
about 30% ± 13%, by mass, as much feces as Americans, and through their diet,
constitute about 25–30% of the environmental impacts from animal production in
terms of the use of land, water, fossil fuel, phosphate, and biocides. Dog and
cat animal product consumption is responsible for release of up to 64 ± 16
million tons CO2-equivalent methane and nitrous oxide, two powerful greenhouse
gasses. Americans are the largest pet owners in the world, but pet ownership in
the US has considerable environmental costs.
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