It's a jungle out there
An SUV driven a modest 10,000 kilometres a year, uses 55.1 gigajoules, which includes the energy required both to fuel and to build it. One hectare of land can produce approximately 135 gigajoules of energy per year, so the Land Cruiser's eco-footprint is about 0.41 hectares - less than half that of a medium-sized dog.
Then there are all the other animals we own. Doing similar calculations for a variety of pets and their foods, the Vales found that cats have an eco-footprint of about 0.15 hectares (slightly less than a Volkswagen Golf), hamsters come in at 0.014 hectares apiece (buy two, and you might as well have bought a plasma TV) and canaries half that. Even a goldfish requires 0.00034 hectares (3.4 square metres) of land to sustain it, giving it an ecological fin-print equal to two cellphones.
Posto isto, e porque diariamente nos é exigida responsabilidade ecológica, peguem num bloco, numa caneta e façam as contas ao que têm. Depois peguem numa tábua com um prego na ponta e vão equilibrar o ecossistema - pelo bem do planeta e dos vossos (futuros) filhos.
Eu, no caminho para o trabalho, parei no zoológico e fiz a minha parte. Uma girafa, dois koalas e uma mão cheia de lémures devem cobrir todas as minhas posses.