Lough Neagh is the UK’s largest lake – and it’s being poisoned by toxic algae.

It’s killing dogs, birds, fish and is dangerous to humans. Campaigners say the “toxic soup” is being used “as a toilet” and although it’s treated, it still provides 40% of Northern Ireland’s drinking water.

But without a sitting parliament, where do the people of Northern Ireland turn?

On this episode of Sky News ClimateCast, Tom Heap visits Lough Neagh to see the damage and speak to campaigners and locals outraged by the problem. Plus, he visits the Agri-Food and Biosciences institute which could have a solution to the problem.

Producers: Mickey Carroll and Emma Rae Woodhouse
Editors: Luke Denne and Wendy Parker