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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