Sea Level Rise in India: Why Mumbai and Kolkata Face Growing Risks

Rising Seas, Rising Stakes: Why India Cannot Treat Sea-Level Rise as a Distant Problem The sea does not need to arrive as a giant wave to change a city. Sometimes the danger comes gradually—through higher tides, more frequent coastal flooding, saltwater entering freshwater systems and land that is slowly sinking. That makes rising sea levels one of the most difficult environmental risks to communicate because much of the damage develops quietly, long before it becomes a dramatic headline. A new United Nations report has put that risk into sharper focus. It warns that sea levels are rising faster than at any point in recorded history and that hundreds of millions of people living in low-lying coastal areas face growing risks to homes, infrastructure, livelihoods and basic services. For India, this is not simply an international climate story. It is already a coastal-development question. Why the numbers matter According to the UN, around 770 million people—roughly one in every ten people globally—live in coastal areas less than five metres above the high-tide line and are exposed to significant risks. The report says average ocean levels are rising because warming seawater expands while glaciers and ice sheets lose mass. In 2024, the








