Sea levels have been creeping up steadily. Since 1993, the global sea level has risen by over 10 centimeters, or about four inches. This might not sound like much, but it's a clear sign that something bigger is happening. The rate of this increase is speeding up. Scientists have been tracking this trend using specialized satellites. These satellites use radar altimeters to measure the ocean's height from space. The data shows that the rate of sea level rise has doubled since 1993. This is a big deal because it means the problem is getting worse faster than expected.

The main causes of sea level rise are melting ice and thermal expansion. Melting ice, especially from glaciers and ice sheets in Greenland and Antarctica, contributes about two-thirds of the rise. The rest comes from thermal expansion, where the ocean water expands as it absorbs more heat. In 2024, thermal expansion played a bigger role because it was the hottest year on record. This boosted sea level rise to nearly a quarter inch.

Looking ahead, the melting of ice sheets will become even more important. The ice sheets are melting at an increasing rate. This is a big concern because it means more water will flow into the oceans. The Thwaites Glacier in Antarctica is a particular worry. It's the size of Florida and could dump a huge amount of water into the ocean in the coming years. This could lead to several feet of sea level rise by the end of the century.

The future of sea level rise depends on us. Scientists have created different scenarios for how much the sea levels could rise by 2100. These range from a low scenario, where global warming is stabilized, to a high scenario, where the sea levels rise by several feet. The choices we make today will determine which scenario becomes reality. It's up to us to take action and slow down the rate of sea level rise.

Sea Levels on the Rise: What's Happening and Why It Matters

Actions