The scattering of tiny black particles regularly patterns our floor – by the door where my sons take their football boots off, under the sofa where they lounge in post-match socks, or here and there, where the granules have rained from clothing. Even when I first recognised what they were, I didn’t know what their real provenance was – that they are, in fact, tiny pieces of ground-down end-of-life tyres. The use of this so-called “rubber crumb”, also known as SBR (styrene butadiene ru
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