The causes of climate change

1. The natural causes like changes in earth revolution, changes in area of continents, variations in solar system, etc.

2. Due to human activities the concentrations of carbon dioxide and certain other harmful atmospheric gases have been increasing. The present level of carbon dioxide is 325 ppm and it is expected to reach 700 ppm by the end of this century, because of the present trend of burning forests, grasslands and fossil fuels. Few models predicted an increase in average temperature of 2.3 to 4.6oC and precipitation per day from 10 to 32 per cent in India.

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