"Electricity is measured in watts per unit of time..."
No need to go all physicsey on this one, but what is a watt per unit time? 1 Watt = 1 J per second, so you're proposing 1 Watt per second = 1 J per second squared? The acceleration of energy?
Electricity is measured in watts multiplied by time. Hence, kW.h or Kilowatt hours...
mrpoo has it exactly right. More energy will be required to convert CO2 into a usable energy form, than will be gained out of that new energy form. Unless someone figures out a way to break the second law of thermodynamics.
Misconception: Carbon dioxide is not toxic. Try breathing pure CO2 for 5 minutes and see what happens. Water too, can be toxic, in excessive quantities.
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