The effect of runoff from melting glaciers entering the oceans is that it leads to global rise in sea level.
Why the increase in sea level?
If glaciers do melt, they will lead to more water been stored on land and as such they can be a lot of runoff which is said to often increases the level or rate of water that can be seen in the ocean.
Note that due to the above situation, it may lead or contribute to global rise in sea level and thus can be detrimental to man.
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