The event is celebrated every 22 April by United Nations, and this year is fiftieth anniversary. To celebrate this important moment today a multimedia marathon will be held, a 12-hour live (from 8 to 20) fully broadcast by Rai Play, whose hashtag will be #OnePeopleOnePlanet. At the opening debate conducted by Mario Tozzi, broadcast from 8.50 to 9.20, a researcher from Ispra will participate for issues related to monitoring and protection of the sea.