Positive Effects		Negative Effects (to be minimised by design)
Increases ocean circulation		Environmental cost of construction
Absorbs CO 2 from Air		Releases CO 2 under some weather conditions
Oasis for sea-life, stimulates phytoplankton		Could ingest some deep-sea creatures
Absorbs CO 2 from water by Bio-activity		Subsea Noise
Cool water zones moderate weather
Refuge for displaced islanders