Fact Check: "Sea level rise has doubled in the past decade, now at 4mm per year!"
What We Know
The claim that "sea level rise has doubled in the past decade" is supported by various studies and data sources. According to the NASA/JPL sea level website, the rate of global sea level rise was approximately 2.1 mm per year in 1993 and has increased to about 4.5 mm per year by 2024. This indicates a significant acceleration in the rate of sea level rise, aligning with the assertion that it has doubled over the last decade. The NOAA also reports that the global mean sea level was 101.4 mm (3.99 inches) above 1993 levels in 2023, marking the highest annual average in the satellite record.
Furthermore, the Washington Post highlights that from 1993 to 2023, the rate of global sea level rise indeed doubled, increasing from 0.08 inches (approximately 2 mm) per year to 0.18 inches (approximately 4.5 mm) per year. This corroborates the claim that the rate of sea level rise has significantly increased.
Analysis
While the claim is largely accurate, it is essential to consider the context and nuances of the data. The assertion that sea level rise is currently at "4 mm per year" is somewhat misleading. The most recent data indicates a rate of approximately 4.5 mm per year, which is slightly higher than the claim suggests. This discrepancy, however, does not significantly alter the overall truth of the statement.
The sources cited, including NASA and NOAA, are reputable organizations known for their rigorous scientific standards and data collection methods. The use of satellite altimetry for measuring sea level rise provides a high degree of accuracy and reliability (NASA/JPL). Additionally, the World Economic Forum notes that global sea levels are rising at more than double the pace compared to the first decade of measurements, further supporting the claim's validity.
However, it is important to note that the rate of sea level rise can vary regionally due to factors such as ocean currents and land subsidence, which may not be reflected in a global average. Therefore, while the claim is supported by credible sources, it is essential to recognize the complexity of the issue.
Conclusion
Verdict: Partially True
The claim that "sea level rise has doubled in the past decade, now at 4mm per year" is partially true. While the assertion about the doubling of the rate is accurate, the specific figure of "4 mm per year" is slightly understated, as current estimates suggest a rate closer to 4.5 mm per year. The data supporting the claim comes from reliable scientific sources, but the nuances of regional variations and measurement methods should be acknowledged.
