How much equipment does it take to generate a few milliwatts of electric via cold fusion? This might be a fatal flaw. Same as it would cost trillions and trillions to make enough photo-voltaic cells and wind mills (turbines) to account for 10% of US electricity.
The beauty of natural gas and petroleum products is the equipment to utilize them is relatively cheap. Auto engines and turbines in electric power plants are relatively cheap.
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The principle requirement is engineering creativity and brainpower. That's where we are lacking.