Summary
Scientists warn that even if the world limits global warming to 1.5 degrees Celsius, sea levels could rise significantly over time. This could affect coastlines and communities, as ice in Greenland and Antarctica continues to melt.
Key Facts
- Nearly 200 countries agreed to try keeping global warming to 1.5 degrees Celsius.
- Current global warming trends could lead to a rise of nearly 3 degrees Celsius by the century's end.
- The amount of carbon dioxide in the atmosphere now is similar to levels from 3 million years ago, when sea levels were much higher.
- Observations show that ice melting in Greenland and Antarctica is increasing, though East Antarctica remains more stable for now.
- Computer models suggest sea-level rise may not stop even if warming stabilizes at 1.5 degrees Celsius.
- About 230 million people live within one meter of current high tide lines worldwide.
- Melting may accelerate beyond "tipping points," but scientists are not certain about these thresholds.
