Interesting end products would be carbon fibre, carbon nano tubes, bucky balls, graphite/graphine and the rest of the menagerie of synthetic carbon solids that

Interesting end products would be carbon fibre, carbon nano tubes, bucky balls, graphite/graphine and the rest of the menagerie of synthetic carbon solids that are proving to have so many usefull applications. Sequestering carbon in our built environment seems like a good way to help bring the carbon cycle back into balance.