The air that we breathe is full of poison. But Anirudh Sharma, founder of AIR-INK, believes that we can turn that danger into something useful. His “pollution-filled” pen proves that pollution may be our greatest resource. First, a cartridge, similar to the kind found in printers, is affixed to cars to collect carbon soot from the cars’ exhausts. Next, the AIR-INK team removes toxins, such as heavy metals. What is left is raw carbon, and that is then processed into a high-quality black ink and sold in a pen-like container. One pen of AIR-INK contains 40-50 minutes of car pollution and writes just like a normal pen. here