As sea level rises, the weight on one end increases, causing the plank to bend so pressure goes up at the end but down in the middle where the plank bends upward (see sketch above).

FORBES: The Link Between Global Warming, Sea Levels And Volcanoes

This warming is causing glaciers and ice shelves to melt, releasing large volumes of fresh water into the oceans which not only raises sea level, but also influences regional climate change.

BBC: Polar expedition to study Antarctica's climate history