the cost is too high

In Jefferson County, Indiana, the Pentagon has closed the 200-acre (80-hectare) proving ground where it used to test-fire DU rounds. The lowest estimate for cleaning up the site comes to $7.8bn, not including permanent storage of the earth to a depth of six metres and of all the vegetation. Considering the cost too high, the military finally decided to give the tract to the National Park Service for a nature preserve — an offer that was promptly refused. Now there is talk of turning it into a National Sacrifice Zone and closing it forever. This gives an idea of the fate awaiting those regions of the planet where the US has used and will use depleted uranium.