World warms up.
Air warms up.
Water warms up.
Warm water evaporates faster.
Warm air holds more water vapour per cubic metre.
Warm atmosphere makes wind velocities higher.
Faster winds draw air flow towards the poles.
Cold air near poles causes water to fall as precipitation.
So - in essence, the water is up in the air, and can't fall on the tropics because it's falling near the poles - that's why the UK and northern Europe have had record floods, and some places have had record droughts.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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