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Sands of time

Letters

It seems that at last people are coming to grips with the need for renewable energy. Another problem, equally important, that does not seem to get the attention it deserves, is the exploitation of fertile resources such as iron copper, aluminium, lead, tin, sand, stone, gravel, clay oil gas and coal.

These resources should be conserved as much as possible for future generations and not squandered.

How long will these resources last at present day usage? I wonder if anyone at the Institution could give some idea?

R Baker (M), 1 Gordon Street, Cwmaman, Aberdare CF44 6ND

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