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Our most abundant energy source is ... Our most abundant energy source is coal. We have enough coal to last for 250 years, yet coal also prevents an environmental challenge. George W. Bush April 20, 2005, in Washington.
plenum: plenum: 1. In the philosophy of the Stoics, the whole of space regarded as being filled with matter.
2. An assembly or meeting with all members present.
3. A condition, space, or enclosure in which air or other gas is at a pressure greater than that of the outside atmosphere.
4. The condition of being full; fullness.
5. A space completely filled with matter. American Heritage Dictionary