04 December 2008
Carbon: The Biochar Solution
On his farm in the hills of west virginia, Josh Frye isn't raising chickens just for meat. He is also raising them for their manure. Through a process that some scientists tout as a solution to climate change, food shortages and the energy crisis, Frye is transforming the waste into a charcoal-like substance called biochar that in the long run could be far better for the world than chicken nuggets. "It might look like this is just a poultry farm," says Frye. "But it's a char farm too."
Burn almost any kind of organic material — corn husks, hazelnut shells, bamboo and, yes, even chicken manure — in an oxygen-depleted process called pyrolysis, and you generate gases and heat that can be used as energy. What remains is a solid — biochar — that sequesters carbon, keeping CO2 out of the atmosphere. In principle, at least, you create energy in a way that is not just carbon neutral, but carbon negative.Time