The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
that cause major disruptions in the food chain. The natural world evolved in the same narrow band of stability that we did. With warming or cooling, it may not be that resilient.Earth is technically in an ice age right now – the Quaternary glaciation – and has been for 2.5m years. We don’t notice because, for the past 11,000 years, we have been in an interglacial period, where the ice sheets have retreated to the poles. If Earth became 1.
Of course, that is now unlikely to happen. Feedback mechanisms driven by our greenhouse gas emissions are pushing temperatures ever higher. If we don’t act, we could bring about the end of the Quaternary and the start of an ice-free greenhouse world, in which most of today’s cities would be 50 metres under water.
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