Old landfills are often described as ticking timebombs, but some have already detonated.
In the 1960s, a landfill at Brofiscin quarry in Groesfaen, south Wales – one of a group of old landfills known to contain cancer-causing polychlorinated biphenyls (PCBs) – ruptured, causing a farmer’s cattle to fall ill and calves to be born with serious deformities.