Guest Writers
Biochar for Environmental ManagementBook Review by Ed Sears edited by Johannes Lehmann and Stephen Joseph (2009), Earthscan Books. Biochar is an idea that has recently gained prominence as it holds out the possibility of tackling soil improvement, energy production, mitigation of climate change, and disposal of organic waste. Biochar is organic material which has been heated (to between 350 and 700 degrees C) in the absence or restricted supply of oxygen. It is therefore similar to charcoal, although intended specifically for application to farmland for environmental improvement. Biochar for Environmental Management, edited by Johannes Lehmann and Stephen Joseph, two biochar researchers from Cornell University in the USA and the University of New South Wales, Australia, is a summary of the current state of scientific knowledge on this technology. There has been localised interest in charred woody material or plant waste for some time, but it was the growing awareness triggered by the discovery of pockets of dark, carbon-rich, fertile soils known as Terra Pretta de Indio in the Amazon and the realization that these soils were the result of human activity hundreds or thousands of years ago, that has led to increased interest in its properties and potential.
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