"As pet ownership increases in some developing countries, especially China, and trends continue in pet food toward higher content and quality of meat, globally, pet ownership will compound the environmental impacts of human dietary choices," Okin writes in PLOS ONE. It equivocates less about the impact of pets. Okin at UCLA, is too recent for consideration in the Wynes & Nicholas survey. The study that came out Wednesday, from Gregory S. Their results made headlines worldwide in July, though dog ownership did not feature prominently among them. Wynes and Nicholas pursued dog ownership along with a suite of other lifestyle choices in an effort to determine the most effective ways for individuals to combat climate change. "We would welcome further research on this topic as we found there was insufficient information available to draw firm conclusions." "We found only two studies measuring the carbon footprint of dog food, and the studies gave very different estimates for the size of that impact," Wynes told me via email. This chart shows the disparate results found by two studies of the carbon footprint of dogfood. They could find only two peer-reviewed studies that offered a lifecycle assessment of the impact of dog food, and the two studies-one from Arizona State University and one from Australia-offered conflicting results. Then they just needed the carbon intensity of dog food, and that's when things got complicated. They estimated the energy requirements of each breed, with guidance from the American Kennel Club, and the mass of food each breed needs to consume. They assumed most of the dog's carbon pawprint would come from food, with only a negligible contribution from other sources like toys and trips to the vet. Wynes and Nicholas compared three breeds to assess their relative impact: the Jack Russell terrier, Labrador retriever and St. "Still, we would suggest with some confidence that a smaller dog is likely to have a smaller carbon footprint than a larger dog." "Further research in this area would be beneficial before making environmental recommendations about dog ownership to the public," they write in the journal Environmental Research Letters.
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