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Which of the following sentence is correct?
1.Coal mines constitute a major percentage of the sources which cause damage on the environment.
2.Coal mines constitute a major percentage of the sources which cause damage to the environment.
Normally it's damage to [something].
If it's spatial, you can cause damage on/under/near the surface of [something] (on top/on the side/on the wall/under the stairs).
Required, but never shown