sustainable development

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What is World Hydrography Day? World Hydrography Day is held every year ...

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What is the World Day for Cultural Diversity for Dialogue and Development? ...

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What is the International Day of Conscience? The International Day of Conscience ...

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What is the International Day of Zero Waste? The International Day of ...

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What is World Seagrass Day? World Seagrass Day is observed annually on ...

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What is United Nations Day? United Nations Day, celebrated annually on October ...

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What is World Food Day? World Food Day is an international observance ...

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