Why are they burning books in south Wales?

Leo Hickman of The Guardian writes: "As an act of wanton barbarism, there is little to rival the symbolism of setting fire to a book. It is, therefore, genuinely shocking to learn that book-burning is taking place in south Wales. Pensioners in Swansea are reportedly buying books from charity shops for just a few pence each and taking them home for fuel. With temperatures plummeting and energy costs on the rise, thick books such as encyclopaedias are said to be particularly sought after"