Which of the following problems is not caused by noise pollution?

Consider the following statements about Ramesh Chandra Dagar's work in the field of organic farming:
$I.$ Ramesh Chandra Dagar's work includes bee-keeping,dairy management,water harvesting,composting,and agriculture in a chain of processes.
$II.$ In this process,there is no need to use chemical fertilisers for crops as cattle excreta is used as manure.
$III.$ Crop waste is used for making compost,which is used as natural fertilizer.
$IV.$ Compost generates natural gas,which is used for the energy needs of the farm.
Which of the statements given above are correct?

All statements regarding $BOD$ (Biochemical Oxygen Demand) are correct,except:

How can global warming be controlled?

In order to control environmental pollution,the Government of India has passed the .......... to protect and improve the quality of our environment.

Eutrophication is caused by