Why dont we have biodegradable plastic yet?

In the grocery stores, they charge you a couple cents now to use plastic bags for your groceries to cut down on environmental pollution; but this sounds really stupid to me, when they could just invent biodegradable plastic that actually breaks down instead. With everything else scientists have created, you would... show more In the grocery stores, they charge you a couple cents now to use plastic bags for your groceries to cut down on environmental pollution; but this sounds really stupid to me, when they could just invent biodegradable plastic that actually breaks down instead. With everything else scientists have created, you would think this wouldnt be so hard to do.
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