Which among the following statements is $NOT$ a principle of green chemistry?

During a school field trip,a botany student visited a beautiful pond in a village and collected some plants. He observed that villagers were washing clothes there,and household waste was spoiling its beauty in some areas. After a few years,he revisited the pond and found it completely covered with algae,emitting a foul smell,and the water had become unusable. Can you describe this condition of the pond?

Which of the following statements is $NOT$ in accordance with the fundamental principles of Green Chemistry?

Write down the reactions involved during the formation of photochemical smog.

$A$ large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping,but you find an abundance of phytoplankton. Suggest a reason for the fish kill.

What are the harmful effects of photochemical smog and how can they be controlled?