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On planets that lack a liquid ocean, planetologists can calculate a "mean altitude" by averaging the heights of all points on the surface. This altitude, sometimes referred to as a "sea level" or zero-level elevation, serves equivalently as a reference for the height of planetary features.
19 de oct. de 2023 · At the peak of the most recent ice age, about 18,000 years ago, sea level was perhaps 100 meters (300 feet) lower than it is today. Global warming, the current period of climate change on Earth, is causing glaciers and ice sheets to melt. Melting ice sheets cause an elevation in sea level.
Visualize and download global and local sea level projections from the Intergovernmental Panel on Climate Change Sixth Assessment Report.
10 de abr. de 2023 · ENVIRONMENT. EXPLAINER. Sea levels are rising at an extraordinary pace. Here's what to know. Seas are predicted to rise a foot by 2050, regardless of how much global carbon emissions can be...
Key Indicators. Chart the changes in Earth’s water and ice that most clearly reveal global sea level rise. Learn more about the different causes of sea level change and the scientific background of observations and projecting sea level.
CSIRO/ CC BY 3.0. But even in the absence of waves, it turns out the ocean isn’t really flat at all. It has hills and valleys just like land surfaces do, though they’re relatively small — up to about 2 meters (6.5 feet) high.
If countries cut greenhouse gas emissions significantly (lowest trace), sea level rise by 2100 will be limited to 0.3 to 0.6 meters (1–2 feet). However, in a worst-case scenario (top trace), sea levels could rise 5 meters (16 feet) by the year 2300.
