Lefteris Arapakis rummages through various recycling bags at the port of Piraeus, next to Athens.
For a moment, his gaze settles on the sea, where a glass bottle is floating away. He has been cleaning the Mediterranean for four years and, in the bags, there are several tons of plastic.
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But his eyes remain fixed on the bottle that he could not retrieve from the water.
"Sometimes it is very difficult to know if our work has any impact," Arapakis, who has just won the UN Young Champion of the Earth for Europe 2020 award, told Efe.
