Could Sensors Help Green Roofs Grow?

How environmentally green, really, are so-called green roofs like the one that's on top of the Walmart store in north Portland.

Just as wireless sensors networks increasingly are helping building owners and tenants keep track on energy efficiency and water conservation inside, they are also at the center of several new research projects - including one at the aforementioned Walmart site- that aims to build a better understanding of their performance.

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