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Hemp Concrete

Traditional concrete is very energy intensive to create, so one Asheville, NC, company is looking to change that. Hemp Technologies developed an alternative concrete, called Hemcrete, out of hemp, water and lime that's more durable than regular concrete. Because it's currently illegal to grow hemp in the U.S., Hemcrete costs more than regular concrete, but since the material insulates better than concrete, you make that up that cost over time in energy savings.

Walls constructed with this material are also resistant to fire, mold and insects, and some researchers think that it may even last as long as 700 to 800 years [source: Lawrence].

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