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The earth is warming up so quickly because human activity is adding large quantities of greenhouse gases to the atmosphere by burning fossil fuels, such as coal, oil and natural gas, manufacturing cement and deforestation. As a result of these activities, the level of atmospheric carbon dioxide has increased by around 35 per cent, from its long-term average of 260-280 parts per million (ppm), to around 380 ppm. Green house gases such as carbon dioxide and methane, which we also produce, retain atmospheric heat, so increased levels of these gases contribute to global warming.

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Is Global Warming a cycle?

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What could be an introduction for my speech on global warming?

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