Yes, it is necessary, and sad that it is necessary. So many large industries discharge their waste into rivers such as the Maas, so much so that even the water companies only raised the alarm because they do not know exactly what is being discharged. Then it is also difficult to purify of course. PFAS is a major problem. But then there is also the category of groundwater, where too much animal manure ends up ... All in all a very sad story.
Climate change is another problem and the changing circumstances will cause many more problems. Humanity will have to adapt and innovate to survive, and there is no time to lose. Too much time has already been lost.
Humans are doing a really good job at messing up the planet.