There is 30 per cent more of, the earth's atmosphere today than there was before the start of the industrial revolution in carbon dioxide.
Carbon dioxide is in a gaseous state. The formula which represents carbon dioxide is CO2. Carbon dioxide is formed when an element which has carbon in it burns in the “presence of oxygen”.
The black gas released while burning is known as carbon dioxide. Carbon dioxide is very helpful for the plant in the process of photosynthesis for preparing their food in the presence of sunlight and water.
Thus, carbon dioxide is the answer.
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