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Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured.
calculatedearth shows what our planet looks like at differing sea levels. The first few metres can help visualise the potential effects of localised flooding and perhaps global warming. Above that, it's also a good way to visualise Earth's topography.
Sealevelmap.io is an interactive map exploring global sea level fluctuations spanning the past 135,000 years. Batchelor, C.L., Margold, M., Krapp, M. et al. The configuration of Northern Hemisphere ice sheets through the Quaternary.
The NASA Sea Level Projection Tool allows users to visualize and download the sea level projection data from the IPCC 6th Assessment Report (AR6). The goal of this tool is to provide easy and improved access and visualization to the consensus projections found in the report.
If all of the Earth's ice sheets and glaciers were to melt, sea level could be up to 265 feet (80 meters) above current mean sea level. Temperature causes water to expand or contract , thus increasing or decreasing the volume of the ocean.
Explore historical sea level changes and future coastal flooding projections with NOAA's Sea Level Calculator. Search by location, view curated data sets, and make informed adaptation decisions based on tide station or grid-based insights.
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.