WATER POLLUTION

The video discusses the pollution of the River Oise in France and the innovative solution by French engineers at Bourg-en-sur-Oise, who use fish to monitor water quality. A photoelectric cell triggers a warning light if the fish are too sick to swim upstream, indicating pollution. Fish are replaced weekly to prevent false alarms. When fish swim normally, the water is deemed pure and safe to drink. The video concludes with a brief mention of recurring debates during harvest time.

What is the main environmental issue affecting the River Oise?

• Industrial pollution

• Deforestation

• Climate change

• Overfishing

What innovative method do French engineers use to monitor water quality in the River Oise?

• Fish behavior monitoring

• Water filtration

• Chemical testing

• Satellite imaging

How does the photoelectric cell system indicate pollution in the river?

• By measuring water temperature

• By analyzing water color

• By detecting fish movement

• By counting fish population

Why are the fish in the monitoring system changed weekly?

• To prevent them from escaping

• To ensure they are healthy

• To increase their lifespan

• To avoid false alarms

What guarantees the purity of the water in the River Oise?

• Regular chemical treatments

• The presence of healthy fish

• Advanced filtration systems

• Frequent water testing