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1 Coastal economic-social development and marine disaster The ocean covers 71% of the earth’s surface. It is the cradle of life on earth, the treasure of resources and an important adjuster of the environment. Now we have come to realize that exploration of the ocean is an important solution to global issues including resource shortage,population explosion and environmental degradation. Man must rely more and more on the ocean in order to achieve sustainable development. The 21st Century will be a century of the ocean.