Carbon nanofibres made from CO2 in the air

BBC

Scientists in the US have found a way to take carbon dioxide (CO2) from the air and make carbon nanofibres, a valuable manufacturing material.

Their solar-powered system runs a small current through a tank filled with a hot, molten salt; the fluid absorbs atmospheric CO2 and tiny carbon fibres slowly form at one of the electrodes.
It currently produces 10g per hour.
The team says it can be "scaled up" and could have an impact on CO2 emissions, but other researchers are unsure.
Nonetheless, the approach offers a much cheaper way of making carbon nanofibres than existing methods, according to Prof Stuart Licht of George Washington University.