Bamboo makes a beautiful fence, and because it grows so quickly (as much as 1 ft. a day or more, depending on the species), it absorbs more CO2 than, say, a rosebush. Most homeowners have to restrict its growth, lest it get out of control. Do this, however, and you reduce bamboo's capacity as a carbon sink. Only large-scale plantings, which absorb CO2 faster than they release it, can favorably tip the scales. How big is your yard?