Question

Why has the percentage of carbon dioxide in the atmosphere doubled since the industrial revolution?

Answer 1

After industrial revolution human activities has been increased by several folds. Burning of fossil fuels like petroleum, coal, natural gas in industries and transport has been increased; thermal heating due to steam and home appliances etc has increased enormously. All such factors has disturbed the normal carbon cycle of atmosphere. Natural sources also produce CO₂ in our habitat but it is balanced by carbon sink that removes CO₂. So more human activities has disturbed the normal ratio of CO₂ production and carbon sink. As a result percentage of CO₂ has increased in atmosphere.