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Human activities
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  • Human Activities make great climate change
  • Human uses energies such as fossil fuels to generate electricity, lights, heat, transportation, and so on.
  • Over the last 150 years, burning of fossil fuels are the largest source of greenhouse gases emitted from factories generated by human activities.
  • The excess of greenhouse gases in the atmosphere will trap heat from the sun, causing to increase the earth's temperature.
  • The increase of earth's temperature leads to faster melting of glaciers and permafrost.
  • Global warming is causing the permafrost that last for 40,000 years to thaw.
  • Sea level has been increase 1-2 mm each year caused by global warming and melting of glaciers. The glaciers and ice sheet in some areas become even less stable.
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