Not so slow : "a hectare of urban soil can sequester up to 85 tonnes of atmospheric CO2 per year."
Brian
Source:
carbon capture gardens from : https://www.thenatureofcities.com/2016/02/07/carbon-capture-gardens-a-nature-based-solution-for-managing-urban-brownfield-soils-for-biodiversity-and-ecosystem-services/
Recent research by Carla Washbourne and others at Newcastle University suggests that the FAO may have been too hasty to disregard a role for SIC. Soil carbonate formation was measured over an 18-month period at Science Central, a large brownfield site in the heart of Newcastle-upon-Tyne, U.K. The result was striking: urban soils have a huge capacity to capture atmospheric CO2 and store it inorganically as calcium carbonate (calcite). Calcium availability is the key limiting factor, and this is provided abundantly in brownfield soils that contain demolition wastes such as concrete dust and lime. The carbon capture process is extremely rapid: a hectare of urban soil can sequester up to 85 tonnes of atmospheric CO2 per year. Scaling this up, appropriate management of <12,000 ha of urban land to maximise calcite formation could potentially remove 1 million tonnes of CO2from the atmosphere annually. To put that another way, the U.K. has 1.7 million ha of urban land and proactive management of 700,000 ha for mineral carbonation has the potential to meet 10 percent of the U.K.'s annual CO2reduction target. But, what does 'appropriate' and 'proactive' management for carbonation in urban soils entail? How do we maximise rates of inorganic carbon capture in urban soils and are there important synergies or trade-offs with other urban ecosystem services?
On Mon, Dec 3, 2018 at 3:00 PM VladimirGent <vladimir_kai@hotmail.com> wrote:
The only process on Earth that capture carbon from atmosfere for a long time is zooplancton in the ocean, and it critically dependent on Amazon river system that brings organic food to the ocean. ... I do not belive that Brasil will stop destruction of Amason forest in favor of new agricultural land. We still need to feed that rising population of humans. No one is busy with reducing our population. The rising temperature will melt Siberian permafrost land that will release hell on Earth, as methan gas , 4 times more powerful in GreenHouse effect then CO2, will go to athmosphere in massive amounts. So what we need really to talk about is how to prepare to global climate catastrophe .We are going to expect massive crops falure , becouse of frost and snow in July, several years in a row , naturally floods and extremely dry periods ... And we cannot stop it ... too late ... we can only do something to prepare for it. I work on Genetically modifications that can make plants resistant to the broad range of pathogens.--
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Brian Degger
Brian Degger
twitter: @drbrian
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