It is only a matter of time before a mountainside is brought down. We need climate adaptation help – and we need it now

• Aaron Thierry is an Earth-system scientist and environmental campaigner

It’s “raining old ladies and sticks” is the Welsh equivalent of cats and dogs, and boy did those old ladies mean business when Storm Bert poured out nearly a month’s worth of rain on the Bannau Brycheiniog (Brecon Beacons) over Saturday night. By Sunday, the deluge was surging into the River Taff and through the Welsh valleys, forcing the Taff to burst its banks, bringing misery to communities along its length – including mine in Taff’s Well.

Neighbours, who had been devastated by Storm Dennis in February 2020, were shocked to find that everything they had done to rebuild was undone. Replastered front rooms were submerged yet again. New cars were bobbing once more in the streets.