The negative effects are the high level of CO2 (carbon dioxide) in the oceans, because the more CO2 the ocean absorbs, the less oxygen there is for marine life, as Peter Hannam says: “Warmering seas absorb less oxygen at the surface. Another effect of climate change is that the oceans turn over less, that is, when there is not a lot of circulating oxygen that every living thing needs to live, and one of the main causes is that the hot water does not change places with cold water, because hot water does not change places with cold water. oxygen to move to deep waters where it is needed by unknown marine life