PBL: ‘Te rooskleurig beeld van biomassa’

AMSTERDAM – Er bestaat een te rooskleurig beeld van biomassa in Nederland. Dit komt door de huidige methode die gebruikt wordt om de Co2-uitstoot van houtkap te boekhouden.

Een biomassacentrale die warmte en stroom opwektDit meldt het Plan Bureau voor de Leefomgeving (PBL in een rapport.

Als houtkap gaat toenemen om meer energie uit biomassa op te wekken dan kan dit het bereiken van de CO2-doelen voor 2020 en 2050 eerder moeilijker maken dan dichterbij brengen, zo schrijven de onderzoekers. Het PBL maakt zich vooral zorgen over het gebruik van meer dan alleen afval- en resthout.

Bij het gebruiken van hout voor biomassa gebeuren er 2 dingen. Ten eerste komt er meer Co2 vrij door de verbranding van het hout. Ten tweede is er minder bos beschikbaar om Co2 uit de lucht op te nemen.

100 jaar voordat Co2 vermindert

Het gebruiken van hout voor biomassa veronderstelt dat een nieuwe boom net zoveel Co2 uit de lucht gaat halen als bij de verbranding van de oude boom is vrijgekomen, maar dit is niet vanzelfsprekend, volgens het PBL.

Volgens de onderzoekers groeien de vervangend bomen veel minder snel en nemen ze daardoor ook minder Co2 uit de lucht.

“Dan duurt het in veel gevallen meer dan 100 jaar, voordat er een vermindering van CO2 in de atmosfeer optreedt ten opzichte van de situatie met fossiele brandstoffen.”

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