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Energethique » Blog Archive » Tordons le cou aux préjugés : Quand c’est vert c’est pas forcément vert !

Tordons le cou aux préjugés : Quand c’est vert c’est pas forcément vert !

La combustion du bois de forêt pour produire de l’énergie est en fait plus polluante et dangereuse pour l’environnement que l’utilisation de l’essence ou du charbon, affirme mercredi Greenpeace Canada dans un rapport basé sur de nombreux travaux de recherche.

Plusieurs provinces canadiennes ont ouvert les forêts publiques à l’extraction à grande échelle de matière végétale (arbres, arbuste, souches, racines et feuillages) pour produire de l’énergie à partir de leur combustion dans des centrales électriques.

L’association écologiste qualifie cette politique de « biomascarade » et fait remarquer qu’il n’y a eu aucun débat public sur la question ni mise en place de règles environnementales adéquates.

Contrairement à ce que prétendent les autorités et les compagnies intéressées, Greenpeace affirme que la combustion ces arbres n’est pas « carboneutre », autrement dit qu’elle ne présente pas de bilan neutre des émissions de dioxyde de carbone et plus généralement de gaz à effet de serre.

En fait, les centrales électriques nord-américaines fonctionnant à la biomasse « émettent jusqu’à 150% de plus de CO2, 400% de plus de monoxyde de carbone irritant pour les poumons, et 200% de plus de particules fines qui causent l’asthme », affirme Nicolas Mainville, responsable de la campagne « Forêt » de Greenpeace dans son rapport.

Par ailleurs, les émissions de CO2 provenant de la bioénergie forestière ne sont pas comptabilisées parce que les autorités les considèrent à tort comme carboneutres. En réalité, toujours selon Greenpeace Canada, il s’agit d’environ 40 mégatonnes par an, ce qui dépasse celles du parc automobile canadien en 2009.

Le rapport dénonce aussi la croissance des exportations de granules de bois vers l’Europe – 1,2 million de tonne en 2010 – qui a augmenté de 700 pc en moins de huit ans. (belga)

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