When you try to capture CO2 in the atmosphere, you are trying to capture something that is present in very small concentrations – one in two thousandth.
It doesn’t need a genius to figure that doing this is gonna need a lot of energy directly or otherwise, and more energy = more CO2 emissions. Now that doesn’t make sense, does it?
One way to overcome this unvirtuous circle is to use renewable energy for powering whatever needs to be powered to capture the CO2 from the atmosphere, but carbon capture requires more than electricity – it also needs solvents, filters, not to mention the transportation and storage needed post the capture. Each one of these implies carbon happening somewhere in the value chain.
See my LinkedIn post on this topic