Today, the population on earth is increasing, making the population on earth overwhelming. The causes of such condition are: Improving health care quality leads to increased life expectancy and reduced infant mortality; urban concentration, more than 50% of humanity lives in cities; Improving technology, allowing to increase the quantity and quality of food. This situation has consequences: destruction of natural resources, ecosystems; affect health and economy, ... So how do we do? We should reduce the population: there should be only 1-2 children per family. Low resource consumption: use only when needed. Protect the surroundings to ensure good health. 

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