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According to a report published by two New Zealand scientists in the journal New Scientist, the answer lies in the amount of surface area it requires to produce their food. The scientists, Robert and Brenda Vale, note that a medium-sized dog consumes about 164 pounds of meat and 95 pounds of grain in a year. The impact on the environment it takes to produce the meat and grain corresponds to an area of 0.84 hectares. On the other hand, a 4x4 vehicle that travels 10,000 kilometers a year has an ecological footprint of 0.41 hectares, two times less than the dog! Plus, this figure factors in the energy required to produce and power the vehicle...
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