New research has shown the reduced temperatures for green roofs when combined with photovoltaics, thus increasing their efficiency. For more information click here for a great site on green roofs and photovoltaics.
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New Research on Green roofs and photovoltaics
Greening the City 
Really enjoy reading your posts, not sure if you are still contributing to this blog but would love to read more of your thoughts on various LEED strategies 🙂