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Just to clarify something that seems to be bothering people, very small amounts of uranium are found almost everywhere in soil, rock, and water. HOWEVER, concentrated deposits of uranium ores are found in just a few places, almost always in hard rock or sandstone. These deposits are normally covered over with earth and vegetation (in other words, the naturally occouring uranium does exist in an ecosystem, but that ecosystem is deep underground and is not exposed to land animals or plants).
The DU deposited in Iraq back in 1992 was at least 350 tons. That's a lot more uranium than is regularly deposited in ANY surface environment. Normally, uranium deposits larger than 500 grams per square mile can start to effect the natural environment in any given area. The only deposits more than that are found deep under ground. So, to clarify for super awesome moderator Lebell (heh, call me a brown noser), the amount of DU now in the areas where DU was used is exponenially larger than the natural amount that would have been. This can create an imbalance in said environment. Uranium not onl y effects humans at a genetic level, but all organisms. Imagine all animal and plant life developing cancerous growths and many of the organisms not being able to procreate.
Please ask if you need clarification on any of this.
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