The state of Ohio plans to build a sound barrier made out of soil and plants in its attempts at muffling highway noise in an eco-friendly manner. A spokesman for the state transportation department says the 12-foot-high wall will be like a Chia Pet. Workers will water bags filled with soil and seeds and watch it grow. The noise wall will be built this fall. It will span 400 feet along a westbound stretch of I-70 near Columbus. Wisconsin tried a similar idea. It built a sound wall made out of just forms fill with soil and plants, but removed it in 1996 after part of the barrier collapsed.
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