21 Feb '13, 6pm

on Ecobuild Blog - Exactly how much carbon dioxide can a green roof absorb?

Exactly how much carbon dioxide can a green roof absorb? Thursday, 21 February 2013 12:00:00 created by: Sam Bryant In a similar way that renewable energy sources have a carbon ‘payback’ time, green roofs also have their carbon cost and payback period. As any solar panel owner should (hopefully) know, PVCs take high energy manufacturing processes to produce. It’s estimated that by the US Department of Energy that it takes 3.5 years of Californian sun to capture enough energy to replace that used in production, which translates to 7 years in the not so sunny UK. Wind farms, which utilise a resource we certainly have in abundance, take under a year to payback while tidal energy capture can take as little as 8 months. How do green roofs compare? A 2 yearlong study in America produced data on exactly this. By measuring the chemical components of the biomass in both experimenta...

Full article: http://www.ecobuild.co.uk/news-social/ecobuild-blog/post/...

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