Here we have an interesting site, recommended by Isabel...
You'll find a lot of information about our subject, including a form to calculate your ecological footprint
http://www.vidasostenible.org/ciudadanos/mide-tu-huella-ecologica/encuesta-de-la-energia/
http://www.vidasostenible.org/ciudadanos/mide-tu-huella-ecologica/encuesta-del-transporte/
http://www.vidasostenible.org/ciudadanos/mide-tu-huella-ecologica/encuesta-del-residuos-y-materiales/
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