The row at Hampstead Heath is about far more than a few thoughtless swimmers in a heatwave | Rhiannon Lucy Cosslett

As summers get hotter, investment and education are vital to ensure we all have access to the clean, safe water we need

A local row about swimmers and swans in Hampstead Heath has now inspired a government reaction. Environment ministers over the weekend wrote to the City of London Corporation, which oversees the heath, to say that they were “deeply concerned” by footage of crowds of people in the water during last week’s heatwave.

One viral video showed young revellers – who had defied a “no swimming” sign – in a wildlife pond, disturbing the nesting birds. It was picked up by the press, with headlines calling the swimmers “selfish”, “horrible” and “appalling”. Like many who saw it, I was saddened and shocked at the disregard for animals: people were clambering over nests, and trying to reach an island specially safeguarded for birds. Yet I also wondered what a polarised, emotive debate is going to achieve when, lurking behind the justified anger, is another question about our access to water.

Rhiannon Lucy Cosslett is a Guardian columnist