Ocean levels are rising, which means that more water ends up in oceans than before, leaving less for lakes and rivers. In addition, more and more water is distributed in other places than before (watering plants and fields to feed more and more people, and more watering is needed because it does not rain as much as before).
The cycle of water evaporating > becoming clouds > raining back on land > refilling lakes and rivers is disturbed because of climate change. The amount of water stays the same, the water is not lost, but it is distributed to other places, leading to draughts for rivers and lakes. Oceans cover 70% of the Earth‘s surface, so for those enormous areas of water to rise just a few inches, a gigantic amount of water has to be redistributed from glaciers, rivers and lakes.
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