Miscanthus energy plant on a field polluted with heavy metals.
Photo: Ana Fernando, Thünen-Institut.


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To develop concepts that will help solve the conflict and competition for land between food production and biofuel production reliable figures are needed about how much surplus land or residual areas are available for energy-plant cropping. But such figures are lacking.

How much surplus land or residual areas are available worldwide for the production of biofuel? To get to the bottom of this problem, an international team of scientists evaluated 170 studies and publications and the findings were published in October 2012 in the study „Bioenergy from “surplus” land: environmental and socio-economic implications“.

In the current debate on biofuel it is often proposed that such surplus or residual land should be used more intensively to grow energy plants, and thus mitigate land-use competition with food production.  To date, however, no uniform definition is on hand for what “surplus” fallow land is, nor is it clear how much land is indeed available and what yield potential it has. Specialist literature contains assumptions ranging from 250 million to 1,580 million hectares. This enormous bandwidth comes from the fact that different types of residual areas are included and are calculated with different potentials and very often, the social constraints to exploiting the given areas are not sufficiently taken into account.

Scientists propose, therefore, that the term „surplus land “ be given a clearer definition and that both the constraints and the opportunities for sustainable biofuel land-use be considered.

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