Summary:
- Climate change is causing significant changes in the world's oceans, leading to a decline in ocean productivity and the loss of marine biodiversity.
- Warming ocean temperatures, ocean acidification, and changes in ocean currents are all contributing to the "ungreening" of the oceans, which means a reduction in the growth of phytoplankton and other marine plants that form the base of the ocean's food chain.
- This decline in ocean productivity can have far-reaching consequences for marine ecosystems, fisheries, and the livelihoods of people who depend on the oceans for their food and income.