Biochar is incredible. It doubles crop yield, improves soil fertility forever and improves the water retention capability of soil (a buffer against drought). Great climate change adaptation.

And, biochar sequesters carbon and greatly reduces smoke from crop waste burning. Great climate change mitigation.

Watch this video. The pile on the left is the traditional method of burning maize stalks in Africa – light the pile on the side and let it burn to ash in a cloud of smoke. We train farmers to make one simple change – light the pile on the top. The reduction in smoke is stunning. And, they make biochar by quenching the embers with dirt or water.