Biochar seems to be the latest new craze in everything agriculture and biofuel related. It seems a term we are all going to be hearing a lot more of soon.
The basic idea is green waste is converted, by means of a process called slow pyrolysis, into a high carbon byproduct that is beneficial to soil fertility. By adding it to crop land not only is the need for fertilizer inputs reduced, but the carbon is trapped in the soil for potentially thousands of years. The process of slow pyrolysis also produces energy that can be converted into electricity in a similar way as burning biomass.
National Geographic recently ran a program on Terra Preta soil discovered in the Amazon rainforest, apparently as a result of an ancient civilization that built up their soil with biochar. Alan of Bishop’s Homegrown recently made a post on this, and expressed an interest in making his own biochar.
On the other end of things Archer Daniels Midland (ADM), the largest food processing company in the US, is preparing for a big push with this technology. They see biochar working together with GM crops, used for food and biofuels, in a supposedly sustainable and environmentally friendly way.
Personally, I find it very exciting that someone like Alan is working on it on his own farm. It would be great if it turned into a way to make local and small scale agriculture less dependent on chemical and other inputs, and increased productivity. Likewise, I find it very suspicious that anything good can come from ADMs interest in the technology, and doubt very much they will implement it in an environmentally friendly and sustainable way in the end.