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More companies create tools for rooftop gardening
Posted: 06.18.2010 at 9:53 AM
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Using orange-hot metal that's been forged into everything from car components and hand tools to machine gun parts, Trenton Forging is working to turn wasted heat into nurturing warmth for a year-round, rooftop greenhouse.  / AP photo
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As interest in homegrown food grows, more companies develop technology for rooftop gardens

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