The fluid external core of Earth may be the biggest storage tank of carbon in the world. 

The portion seems tiny, someplace in between 0.3% and also 3%, once you take into consideration the size of the outer core (1,355 miles (2,180 kilometres) thick) it corresponds to an enormous amount of carbon — someplace in between 5.5 and also 36.8 yottagrams. (That’s the number complied with by 24 nos!)