Biotechnological methods have been devised for some environmental' problems like the following;
(i) pollution control,
(ii) development of sources for renewable energy,
(iii) restoration of degraded lands and
(iv) biodiversity conservation.
For instance, microbes are being developed to be used as biopesticides, biofertilizers, biosensors, etc.,
and for recovery of metals, cleaning of spilled oils and for a variety of other purposes.
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