In everyday conversation, ‘threshold’ is used in two ways. First, the physical act of entering a building is sometimes called ‘crossing the threshold’. Second, we might describe society as being at ‘the threshold of a new age’ following an important technological breakthrough, or major political upheaval. In A-level human and physical geography, threshold has a third — and more specialised — meaning:
The threshold concept is closely linked with other equally important specialised concepts used widely in geography, such as resilience (see Geographical Ideas in GEOGRAPHY REVIEW Vol. 25, No. 2) and positive feedback (GEOGRAPHY REVIEW Vol. 30, No. 3).
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