The principle behind this is diametrically opposed to the previous approach, in that instead of relying on the pollutant becoming attenuated and spread over a wide area, it is an attempt to gather together the offending substance and prevent its escape into the surrounding environment.
The inherent contradiction between these two general methods is an enduring feature of environmental biotechnology and, though the fashion changes from time to time, favouring first one and then the other, it is fair to say that there is a place for both, dependent on individual circumstances. As with so much relating to the practical applications of biotechnologies to environmental problems, the idea of a 'best' method, at least in absolute terms, is of little value. The whole issue is far more contextually sensitive and hence the specific modalities of the particular, are often more important concerns than the more theoretically applicable general considerations.
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