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Since the first humans carried a torch to provide light, heat has been a by-product of producing light. Traditional electric lights give off more heat than light. But LEDs are twice as efficient as fluorescents at converting electricity to light, generate very little heat, are nearly maintenance free and provide a high quality of light. So what's standing in the way of their broad adoption?
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Article
Although there are many benefits from investing in and working within metropolitan areas and inner cities, much of the information about opportunities is fragmented and scattered.<br />
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As 2009 sputters to an end, it's perhaps unsurprising that we're in the midst of a torrent of studies and findings that all offer some roadmap of where to go from here.
by Joel Makower