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In this earth's atmospheric's oxygen gas is 21% , n2 is 78% , and co2 is 1/3 %. it means proper things is proper place.And in human activities there should be change in our universe. which is 13 billion old.Co2 gas 'll be incease day by day cause of people's creates lot's of industries i.e. factories , its produce MH4(METHANE) nd co2 (carbondioxide) Cause of Big Hole in OZONE LAYERS. If this o3 hole increase day by day our atmosphere 'll be dangrous position. JUST IMAGINE AND TAKE RIGHT DECISION
