It is a common proverb: Prevention is better than cure. It is a good suggestion and common advice. It simply warns someone to stay away from danger or prevent sickness as much as possible. Think about it this way: would you rather take medicine and be in pain or maintain a healthier lifestyle and stay healthy?
Prevention is always better than cure, as it results in less discomfort, cost, and use of resources. From an environmental perspective, it is much easier and convenient to protect the water quality of a river or stream by not adding any waste to it. That is prevention (preventing any pollutant from entering the stream). If instead we did not prevent pollution, the only cure would be to clean the water of the stream, which is going to be not only expensive and resource-intensive but also uncomfortable to people affected by it (say, those living downstream of the point of pollution, etc.).
We can think of many other similar scenarios, like a lab accident due to negligence on the part of the researcher. A number of examples can be seen day-to-day as well.
Thus, it is always better to prevent something from happening than to look for the cure.
Hope this helps.
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