Global warming is raising global average sea level in two ways.
Glaciers and ice sheets around the world are melting and adding water to the ocean.
As the water warms, the ocean expands, so the sea level rises.
more than 4 million people are expected to live below sea level in 2100
As sea levels rise, coastal communities can expect more frequent and more severe flooding from high tides and storm surges.
Many coastal communities are already seeing effects of rising seas
Climate change is primarily due to the burning of fossil fuels such as coal, oil, and gas.