During training, members of the military fire hundreds of thousands of bullets and artillery at firing ranges. Unfortunately, many of those shells are never retrieved, posing an environmental issue: they don’t degrade for hundreds of years. So the military wants to find a way to make biodegradable bullets, complete with plant seeds, according to Engadget.

The Department of Defense is soliciting proposals for biodegradable ammunition loaded with seeds that will grow into plants beneficial to the environment—ones that eliminate contaminants from corroding ammunition. The seeds would only start growing after a few months in the ground.

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