Almost 90 per cent of wild plants and 75 per cent of leading global crops depend on animal pollination.

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As the philosopher David Chalmers puts it in his book The Conscious Mind (1998): ‘Given any account of the physical processes purported to underlie consciousness, there will always be a further question: why are these processes accompanied by conscious experience?’ For example, when you step on a stray piece of Lego left on the living room floor, certain neural processes occur and there is activity in your pain receptors. But why should these neural processes and activity be accompanied by a feeling of ouch, as opposed to a feeling of calm, or of relief, or of no feeling at all?

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