Do dogs take a bigger bite out of the Earth than gas-guzzling sport utility vehicles? That's the contention of a pair of academics in New Zealand, who figure that a medium-sized dog has twice the eco-footprint of a Toyota Land Cruiser.

In Time to Eat the Dog, the real guide to sustainable living, Robert and Brenda Vale calculate that it takes roughly 2.1 acres to produce all the meat and grains consumed by a typical medium-sized pet pooch in a year, compared with about an acre needed to produce the energy burned in the SUV. 

The pair, architects who specialize in sustainable living at Victoria University in Wellington, don't just pick on dogs, but go after all pets as another form of conspicuous consumption that's taking a toll on the planet. They suggest those who care about living sustainably but just can't live without a pet consider sharing one with others.  Or, they add, get pets that serve a dual purpose, of companionship and food, like say, hens.

Hmm, our two Corgis better watch out.

For more on this, go here and here.