content: Ok, but what about the double-spend to mine and capture all that carbon, and then also to remove carbon expelled in exhaust? It's easy to write this off if you live in a clean-air part of America, but in Hong Kong, you can safely look at the sun with your naked eyes on most days, and the pollution meters peg out at their maximum readings fairly often.  This is likely a rather cost effective approach, especially if there are gains made in manufacturing this ink with traditional industrial processes.