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In the UK, we do not generally have AC.
In the UK we have nearly as much obesity as the US.
Think about it - in the 50's loads of new things were invented or became more widespread, inclding TV, automatic transmissions, space launches, etc.
Did the increasing number of rockets being launched cause the obesity epidemic? Obviously not.
The link is that incomes rose in real terms, whilst the price of food fell. Sedentary pasttimes overtook active ones, and people stopped moving about so much, ate more food and grew arses that could provide shelter to a family of four.
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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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