Increase in human population results in the increase in ocean warming. Most heat energy from global warming goes into the ocean, and not into the atmosphere or warming up the land. Marine organisms are moving to cooler parts of the ocean as global warming proceeds.2. Increase in human population results in increase in human demands which can further result in overfishing. When too many fish are taken out of the ocean it creates an imbalance that can erode the food web and lead to a loss of other important marine life.3. Increase in human population results in marine habitat loss. Coastal ecosystems are being particularly damaged by humans which further results in the marine habitat loss especially coral reefs. Coral reefs are microbially driven ecosystems that rely on marine microorganisms to retain and recycle nutrients in order to thrive in oligotrophic waters.