Global Warming

• An increase in the average temperature of Earth’s near surface air and oceans since the mid-20^th century
• 4^th assessment report of IPCC: global temperature increased 74+0.18 degree C during the 20^th century.
• Caused by greenhouse gases
  • Water vapour, Co2, Methane, Nitrous Oxide, Ozone, CFCs (in order of abundance)
• Since the industrial revolution, the burning of fossil fuels has increased the levels of Co2 in the atmosphere from 280 ppm to 390 ppm.

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