エコロジカル・フットプリント指標によるトマト生産の持続可能性評価 : ハイテク農業は食糧問題解決の切り札か(<特集>食糧問題)
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概要
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It is widely believed that hydroponic greenhouse technology can increase output per hectare of land far beyond that of conventional field production. It is questionable, however, if high-tech agriculture is really more productive, because it requires many inputs and the production of these inputs "appropriates" the production of additional land. This study tested whether hydroponic farming is more productive than the traditional field farming. The concept of the Ecological Footprint was used for this comparison. I assessed and compared the biophysical inputs required by these operations to produce 1,000 tonnes of tomatoes. These figures were translated into corresponding land areas (in various categories) necessary to produce the required biophysical inputs. In contrast to common belief, this study showed that hydroponic greenhouse tomato production requires 14-21 times more land than conventional field operations to produce the same output. Society should not depend on high-tech agriculture for our food production. Rather, we should invest more in "natural capital" through such ways as preserving agricultural land and water resources, preventing soil erosion, and restoring degraded forests, and allowing salmons to ascend rivers, which transport oceanic nutrients to forests. This study also showed that hydroponic agriculture is a prime example of apparent economic success which is, in fact, ecologically inefficient and unsustainable. The underpricing of depletable energy and other inputs to hydroponic production enables operators to profit while unconsciously appropriating the productive capacity of landscape vastly larger than their own physical plant.
- 一般社団法人日本エネルギー学会の論文
- 2003-01-20
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- エコロジカル・フットプリント指標によるトマト生産の持続可能性評価 : ハイテク農業は食糧問題解決の切り札か(食糧問題)