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The amount of public money available to make Welsh coal tips safe "only scratches the surface", according to evidence heard by a parliamentary committee.
The Welsh Affairs Select Committee was told there was a "disparity between the scale of the challenge and available funds" to remediate high risk coal tips.
Representatives from four local authorities explained some of the challenges they face in dealing with the legacy of Wales' industrial past.
Chancellor Rachel Reeves, announced £118m in her spending review on Wednesday to "keep coal tips safe in Wales".