Word: lehmann
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...settlement is being built miles outside Abu Dhabi, contributing to the energy-intensive sprawl growing throughout the emirate. And while Masdar City promises to use the greenest technologies on the market, that won't make it livable. "It looks a bit like a prison to me," says Steffen Lehmann, an urban-design professor at the University of Newcastle in Australia who spoke at WFES. "It's going to be a 1% token-green enclave, while the rest of [Abu Dhabi] goes about business as usual...
...nonexistent. The World Wildlife Fund says the U.A.E. has the biggest per capita carbon footprint in the world, and parched Abu Dhabi uses more water per person than anywhere else. There are no plans to put a price on carbon, as even the U.S. is considering. Lehmann and others would prefer to see Masdar spend its billions greening Abu Dhabi itself, not building an entirely new settlement in vacant desert. "We have to have every city be an eco-city," Lehmann says...
Centuries later, it was still there, enriching the soil. "You couldn't help but notice it. There would be all this poor, grayish soil, and then, right next to it, a tract of black that was several meters deep," says Johannes Lehmann, a soil scientist who worked in Manaus, Brazil, in the late 1990s. After he left the Amazon in 2000 for a job at Cornell University, N.Y., Lehmann started wondering what would happen if farmers today could make their own terra preta. He has found one answer in a field trial in Kenya, where 45 farmers achieved twice...
...carbon stock in the atmosphere," says Tim Flannery, chair of the Copenhagen Climate Council, a consortium of scientists and business leaders linked to next year's United Nations Climate Summit. "And for that, slow pyrolysis biochar is a superior solution to anything else that's been proposed." Cornell's Lehmann is even more emphatic. "If biochar could be massively applied around the globe," he says, "we could end the emissions problem in one to two years...
...silver bullet, not by a long shot," says Dominic Woolf, a researcher at Swansea University in Wales. "You have to look at the big picture: pyrolysis itself produces carbon dioxide emissions, and you have to consider that when you try to determine biochar's capacity for sequestration." Lehmann says he welcomes the doubts, and notes that addressing them requires "investors willing to take the risk." Which is where chicken farmer Frye, with his small biochar operation, comes in as one of the few people out there actually making a business of it. With a pyrolysis unit that can create...