A Bubble is a system under which existing emissions sources can propose alternate means to comply with a set of emissions limitations; under the bubble concept, sources can control more than required at one emission point where control costs are relatively low in return for a comparable relaxation of controls at a second emission point where costs are higher.

-See also:
"Bubble" is in the UNSPSC Code "23201005"
Bubble columns

List of books: Bubble

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