In the early morning, when the only sound on Tel Aviv beach is the waves, Yosef Salman and his team pick up plastic debris left by bathers or cast up by the sea.
Working in heat and humidity with large rakes, they scoop plastic cups, cigarette ends, empty sunscreen tubes and soiled babies' nappies.
Also present, but impossible to separate from the sand, are microplastics, tiny particles of plastic debris that have been broken down by sun and salt.