Anthropogenic climate change has exposed ocean and coastal ecosystems to conditions that are unprecedented over millennia , and this has greatly impacted life in the ocean and along its coasts . Fundamental changes in the physical and chemical characteristics of the ocean acting individually and together are changing the timing of seasonal activities , distribution  and abundance  of oceanic and coastal organisms, from microbes to mammals and from individuals to ecosystems, in every region. Evidence of these changes is apparent from multi- decadal observations, laboratory studies and mesocosms, as well as meta-analyses of published data. Geographic range shifts of marine species generally follow the pace and direction of climate warming : surface warming since the 1950s has shifted marine taxa and communities poleward at an average  of 59.2 + 15.5 km per decade , with substantial variation in responses among taxa and regions. Seasonal events occur 4.3 + 1.8 d to 7.5 + 1.5 d earlier per decade among planktonic organisms  and on average 3 + 2.1 d earlier per decade for fish . Warming, acidification and deoxygenation are altering ecological communities by increasing the spread of physiologically suboptimal conditions for many marine fish and invertebrates . These and other responses have subsequently driven habitat loss , population declines , increased risks of species extirpations and extinctions  and rearrangement of marine food webs . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report