Climate change is not the only factor affecting sea levels

Updated: Oct 8, 2021

There are a number of factors that can affect sea levels, and consequently the tides. As climate change is increasing at an alarming rate, we cannot help but notice the rise in sea levels. However, the moon also has something to do with the fluctuation of the waves. Due to the gravitational pull of the moon, and partly due to that of the sun, a cycle of almost 20 years is formed.

Here, there are periods of low tides and high tides which depend on the alignment of the moon with respect to the earth and the sun. When the sun, moon and earth are perfectly aligned, there is maximum attraction between them, causing high tides, while a 5 degree shift in the moon, which is the maximum distortion, causes the minimum repulsion.

There will be considerable consequences for the coastal cities which are vulnerable to high tides, and when combined with the climate change which induces rising sea levels, cities will have to take precautionary measures well before the next high tide, which is in about 12 years. However in the long term, as the high tides induced by the moon are inevitable, there must be a reduction in climate change to reduce the risks at coral cities.

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