Explain the cause of global warming. Why is it a warning to mankind?

1.	Explain the cause of global warming. Why is it a warning to mankind?
Answer» Cause of global warming: Deforestation Rise in the concentration of greenhouse gases ( `CO_2,CH_4,CFC_5,N_2O`) Burning of fossil fuels. Rise in industrial wastes and pollutants Global warming is a warning to mankind because : (i) Rise in temperature is leading to increased melting of polar ice-caps as well as of other places like the Himalayan snow caps. This will result in a rise in sea level that can submerge many coastal areas. Deleterious changes in the environment results in odd weather and climate changes, e.g., EI Nino effect.

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(i) Arrange the following compounds in an increasing order of basic strength : `C_(6)H_(5)NH_(2), C_(6)H_(5)N(CN_(3))_(2), (C_(2)H_(5))_(2)NH and CH_(3)NH_(2)` (ii) Arrange the following compounds in a decreasing order of `pK_(b)` values: `C_(2)H_(5)NH_(2), C_(6)H_(5)NHCH_(3), (C_(2)H_(5))_(2) NH and C_(6)H_(5)NH_(2)`
Rerrange the following in an increasing order of their basic strengths: `C_(6)H_(5)NH_(2),C_(6)H_(5)N(CH_(3))_(2),(C_(6)H_(5))_(2)` NH and `CH_(3)NH_(2)`.
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Explain the cause of global warming. Why is it a warning to mankind?

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