If safe storage is really the goal (I think part of the thinking is that we might someday have a use for the "waste") it seems highly technically feasible to en

If safe storage is really the goal (I think part of the thinking is that we might someday have a use for the "waste") it seems highly technically feasible to encase it suitably, and drop it on the subducting side of the Mid-Pacific Subduction Zone. Since the containers would be very dense, they'd embed deep into the sediment, many thousands of feet underwater. Over geologic time, subduction would draw them deeper and deeper, eventually into the Earth's mantle. Problem solved, if permanent disposal is truly the goal.