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http://www.filefactory.com/file/1xsdbq4pgb21/BIOFUEL1.ppt
GLOBAL WARMING:-The average increase in temperature of the atmosphere due to  increase in the concentration of the greenhouse

http://mwfiles.net/_9tmY7
NOISE POLLUTION:-Noise pollution or noise disturbance is the disturbing or excessive noise that may harm the activity or balance of

http://firecash.org/download/_DNCRa
BIOFUEL:-A biofuel is a fuel that is derived from biological materials, such as plants and


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