The relationship between the oceans and human society is quite close, with seafood accounting for 20 per cent of the world's animal protein intake of about 2.9 billion people, as a transport and large-scale medium of trade, and the focus of the lives and cultural values of many coastal residents, according to the latest statistics from the Food and Agriculture Organization of the United Nations. In addition, marine ecosystems provide many important services, such as the circulation of nutrient salts, carbon sequestration, coastal protection, climate regulation, oxygen supply, and so on.
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