Hot air balloons work by burning fossil fuels, a normally one-way reaction which produces heat and CO2

Image by Jon Sullivan

 

Currently we take carbon from the ground, burn it and add it to the air as CO2 - which contributes to the greenhouse effect. If we could take carbon from the air and convert that into something combustible the net CO2 would be zero. http://www.wiley-vch.de/vch/journals/2002/press/200915press.html Does anyone know how viable this is as a means of sustainable energy?

 

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