Desert 'carbon Farming' To Curb CO2

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작성자 Sergio Sever
댓글 0건 조회 6회 작성일 25-01-13 04:15

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Desert 'carbon farming' to curb CO2

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1 August 2013

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By Matt McGrath

Environment reporter, BBC News

Scientists say that planting big numbers of jatropha trees in desert areas might be a reliable method of curbing emissions of CO2.

Dubbed "carbon farming", researchers state the idea is financially competitive with state-of-the-art carbon capture and storage tasks.

But critics state the idea might be have unexpected, negative impacts consisting of up food prices.

The research study has been released, external in the journal Earth System Dynamics.

Seeds of modification

Jatropha curcas is a plant that came from Central America and is really well adapted to severe conditions consisting of extremely dry deserts.

It is currently grown as a biofuel, external in some parts of the world since its seeds can produce oil.

In this study, German researchers revealed that a person hectare of jatropha might catch as much as 25 tonnes of co2 from the atmosphere every year. The scientists based their estimates on trees presently growing in trial plots in Egypt and in the Negev desert.

"The outcomes are frustrating," stated Prof Klaus Becker, from the University of Hohenheim in Stuttgart.

"There was excellent growth, a good reaction from these plants. I feel there will be no issue trying it on a much larger scale, for example ten thousand hectares in the beginning," he said.

According to the researchers a plantation that would cover three percent of the Arabian desert would take in all the CO2 produced by automobiles and trucks in Germany over a 20 year period.

The scientists say that an important aspect of the plan would be the schedule of desalination centers. This suggests that at first, any plantations would be restricted to seaside areas.

They are wishing to establish bigger trials in desert locations of Oman or Qatar. Prof Becker states that unlike other plans that just balance out the carbon that people produce, the planting of jatropha might be a good, brief term solution to climate change.

"I think it is an excellent idea because we are actually extracting carbon dioxide from the atmosphere - and it is entirely different in between extracting and avoiding."

According to the scientist's estimations the costs of curbing carbon dioxide via the planting of trees would be between 42 and 63 euros per tonne. This makes it competitive with other strategies, such as the more high tech carbon capture and storage, external (CCS).

A variety of nations are presently trialling this technology, external however it has yet to be released commercially.

Growing jatropha not just soaks up CO2 however has other advantages. The plants would assist to make desert areas more habitable, and the plant's seeds can be harvested for biofuel say the scientists, supplying a financial return.

"Jatropha is ideal to be become biokerosene - it is even better than biodiesel," said Prof Becker.

But other specialists in this area are not convinced. They indicate the reality that in 2007 and 2008 great deals of jatropha trees were planted for biofuel, specifically in Africa. But a lot of these ventures ended in tears,, external as the plants were not really effective in dealing with dry conditions.

Lucy Hurn is the biofuels campaign supervisor for the charity, Actionaid. She states that while jatropha was once viewed as the fantastic, green hope the truth was really various.

"When jatropha was presented it was seen as a wonder crop, it would grow on scrubland or marginal land," she said.

"But there are often individuals who require limited land to graze their animals, they are getting food from that area - we wouldn't class the land as minimal."

She pointed out that jatropha is highly poisonous and can contaminate the land it is grown on, even in a desert. And she also had concerns about the fairness of the idea.

"It is still somebody else's land. Why enter and grow these huge plantations to deal with a problem these individuals didn't really trigger?"

Follow Matt on Twitter, external.

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