In those 30 years, the sea level has risen by more than 9 centimeters. This may not seem like much, just a hand's length, but when these changes are visualized as water hitting a ship-like window, it starts to feel very real.

As the planet warms and polar ice melts, our global mean sea level is rising," NASA wrote.

Rising sea levels increase the risk of coastal flooding, coastal erosion and storm hazards (SOURCE): https://svs.gsfc.nasa.gov/5114