Word Count : 500

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Global warming and ozone depletion are two major environmental issues that have emerged from increasing human interference with the natural atmosphere. Although they are different phenomena, both have serious implications for ecosystems, human health, climate systems, agriculture and the overall environmental balance of the Earth. Global warming refers to the long-term increase in the average temperature of the Earth’s atmosphere and surface. It is primarily associated with the enhanced greenhouse effect caused by increasing concentrations of greenhouse gases such as carbon dioxide, methane, nitrous oxide and certain industrial gases. Human activities such as burning coal, petroleum and natural gas, deforestation, industrialisation, transportation and intensive agriculture have significantly increased the concentration of these gases. They absorb and re-radiate outgoing terrestrial heat, causing more heat to remain __________ _________ ___ _________ __________ _____ __________ ___ __________ ___ _______ _______.
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