Carbon removal from the air sounds like paying of credit card debt by aquiring additional credit cards. Is it not the case that it will always take more energy to get carbon out of the air than it does to put it in the air in the first place? If that's the case, we will have to not only replace our current energy consumption by renewable sources, but add a lot of extra energy to drain the atmosphere. And we have to do that within decades. This is probably a naive take, but that's what it feels like.