Phytoplankton are some of the smallest and most plentiful organisms on planet Earth; they are important to the health and well-being of many life forms in a variety of ways. The collapse of the world's phytoplankton population would have dire consequences for our environment and civilization.
Due to global warming, the climatic conditions such as rise in temperature of the coral habitat in the oceans changes. The corals become stressed by changes in conditions. Under these conditions, corals expel the symbiotic algae living in their tissues. This turns corals completely white. This is called coral bleaching. Due to coral bleaching, it becomes more stressed and this can leads to its death. Algae also may not be able to survive alone.