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Crackers r n\made of many chemicals which react with each other when ignited to get a compound and produce flames with diff. colours. they also release out gases which lead to pollution. the present problem that the world around is facing is the GLOBAL WARMING. this is a increasing problem due to more emission of harmful chemicals including CO2. when v burst crackers many gases which aid global warming increase release out and they take the problem to further step. there is also a advantage of bursting crackers. its the killing of mosquitoes. but as demertis r more than merits its better 2 avoid bursting of crackers for our own joy and happiness. 
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