How does biogas produce ?
Separate iron plastic, glass, paper etc. from garbage, it is mixed with water. Then add amount of bacterial in it which produce methane known as biogas.
What do you mean by Biochemical Oxygen Demand $(BOD)$ ?
What do you mean by ozone hole ? What are its consequences ?
Which are the atmospheric air pollutants ?
Explain in short : Pollution of troposphere done by hydrocarbon.
What is green fuel ? Give the information about waste recycling.
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