Biochar draws carbon from the atmosphere, providing a carbon sink on agricultural lands.  Biochar is biologically unavailable, sequestering fixed carbon in the soil for centuries to millennia, providing a potential tool to absorb net carbon from the atmosphere. Each year, agriculture fixes 60 gigatons of carbon, but 60 gigatons of carbon also returns to the atmosphere, resulting in little net change.  Biochar can potentially store a fraction of this carbon in the ground, potentially making a significant reduction in atmospheric GHG levels.  Its presence in the earth can improve water quality by significantly reducing runoff, reducing the need for petrochemical fertilizers, and raise agricultural productivity in marginal soils.