London, UK 25th August 2017. Little Venice Canal is covered in Algae after the recent warm weather.If the algae is toxic it uses up oxygen in the water at night which can suffocate fish and other creatures.Advise from the UK Enviroment Agency is to assume it is toxic and keep pets and children away from the water and avoid skin contact with the water or algae. Credit: claire doherty/Alamy Live News

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