Causes of global warming:
i. Deforestation
ii. Rise in the concentration of greenhouse gases (CO, CH4, CFCs, NO).
iii. Burning of fossil fuels
iv. 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.
ii. Deleterious changes in the environment results in odd weather and climate changes, e.g., El Nino effect.
