Sea level: what to know and what we can do about global sea level rising

Sea level rise: a cause for concern?

Earth’s seas are rising, a direct result of a changing climate. The global sea level is rising at a rate unmatched for at least thousands of years. The primary reason is that global temperatures are rising, causing ocean water to expand – as it absorbs massive amounts of heat trapped by greenhouse gases in Earth’s atmosphere – and land ice to melt. About a third of its current rise comes from thermal expansion – when water grows in volume as it warms. The rest comes from the melting of ice on land.Sea level changes will affect the way we live and where we live as a human species. Some regions could become dangerously hot and others uninhabitable because of rising sea levels. It has been estimated that by 2050 the coast of Mainland China, Bangladesh, India, Vietnam, Indonesia, and Thailand may be below average annual coastal flood. Low-lying island nations in areas such as the Pacific Region could disappear under rising seas.

Nasa and sea level rise

NASA has been investigating sea level rise for decades with all sorts of sophisticated instruments: satellites, airborne missions, shipboard measurements, and supercomputers. Satellites are particularly effective because they allow scientists to calculate the change in height of the ice sheets to within a fraction of an inch, and how changing ice sheets are contributing to sea level rise.