Photosynthesis makes the glucose that is used in cellular respiration to make ATP. While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration. :)
yes negative effects outweigh the positive because of there isn't much positive and all the components withing the ship may pollute the ocean and lead to worst case scenarios.
