This affects not only the land, but the sea as well. The upper level of the world’s oceans have been warmed.
When water particles get warmer, they get more energy, thus they start moving more and away from each other (like how you would back away from the weird person dancing wildly). The increased distance between the particles means that there is more volume.
Case in point.
Thus, when water is warmed, its volume increases - this is called thermal expansion.In the meantime, rising temperatures also cause ice melt. All this melted ice and snow flows back into the ocean.
Coupled with thermal expansion, it is the reason why the global mean sea level is rising at increasing rates. Yup, it is accelerating.
All this extra water has no where to go except to flow onto land. This causes flooding for coastal land areas.
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