
From: http://www.myessentia.com/blog/toronto/files/2011/04/3763807210_aabec70b53.jpg
Toronto is the first city in North America to require green roofs by law and has now passed into its third phase. All new buildings with a floor area of 2,000 sq metres are required to devote 20-60% of available roof space to vegetation. Lower utility bills result with reduced heat loss in winter and reduced heat gain in summer.
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What are those pyramids? Solar panels?
I assume they are solar panels and it would certainly fit in with the concept of the green roof.