Prior to the current disaster, I was interested in the effects that climate change would have on the earth. The melting of glaciers can have profound effects on a region. The result is a major redistribution of weight. As I recall the shorelines of ancient Lake Missoula rose after the melting of the area glaciers. Conversely, there were localized earthquakes caused by the filling of Lake Powell.
Water is highly liquid...it is heavy. The climate determines the distribution of this weight.
It seems to me that melting glaciers would have two effects: it would lighten the weight sitting on the areas once covered by the glaciers. It seems to me that a massive melting of glaciers would also increase the over all weight pressed down by the oceans. An unscientific guess would be that global warming would result in a downward force on ocean trenches and and upward force on mountains.
Unscientifically stated: I would not be surprised to see increased seismic activity as we turn this little blue planet of ours brown.