Global Warming

• Global warming: This is the long-term increase in temperature in the world
• Causes of Global warming:

  The main cause of global warming is greenhouse gases.

  Namely;

  1. Carbon dioxide
  2. Nitrous oxide
  3. Argon
  4. Fluorocarbons
  5. Methane
• How does global warming occur:

  • The earth is warmed during the day by incoming/ solar radiation from the sun
  • At night, the earth loses its heat through outgoing/ terrestrial radiation from the ground
  • Accumulation of greenhouse gases in the lower in the lower atmosphere leads to formation of a blanket of the gases
  • The blanket prevents escape of terrestrial radiation to the higher atmosphere
  • The heat from the ground on reaching the blanket is absorbed and some bounced back to the ground
  • The heat trapped between the blanket and the ground causes rise in temperature in the world
• Greenhouse gases: Its the process by which heat trapped in the lower atmosphere warms the earth's surface to higher temperatures than normal