Question
Explain the causes of global warming. Why is it warning to mankind?

Answer

Causes of global warming:
  1. Deforestation.
  2. Burning of fossil fuels.
  3. Excess use of nitrogenous fertilisers.
  4. Increased amounts of greenhouse gases $(CO_2 CH_4CFCs, N_2O).$
It is a warning to humans because:
  1. It leads to deleterious changes in the environment resulting in odd climatic changes.
  2. It can lead to melting of polar ice caps and ice caps on mountain tops and result in a rise in sea level which can submerge many coastal areas.

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