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I recently saw plans for a DIRIGIBLE using HELIUM instead of HYDROGEN. It could take off and land anywhere, and used much much less energy to travel, and could travel about 120 miles per hour. The use of DC power instead of AC would greatly reduce our footprint too, and well insulated homes or the ability to get away from the SEVENTY TWO DEGREE mentality and accept temperatures from 62 to 83 degrees (I call it the 21 degree mentality) will reduce consumption tremendously. I believe it is at least 2% reduction for every degree change.