Anirudh Sharma doesn’t just want to pull harmful carbon from the air. He wants to offer a cheaper alternative to the exorbitant costs of ordinary printer ink. Sharma recently invented “Kaala,” a device that can gobble up harmful pollutants and instantly repurpose them, with a little help from alcohol and oil, into black printer ink. One day, Sharma hopes to commercialize the device so it can live in every home around the world. The idea…