the posidonia is giving a lot of things to us.ime it's contributing to the beaches. most of the sand that we have on the beaches comes from the skeletons of millions of organic things that lives inside the posidonia jungle. formentera is a small island in the middle of the mediterranean. if we have stable beaches, it's thanks to the underwater reefs that the posidonia is building along centuries. in this 30 years i'm witnessing how the posidonia is more and more in dangered. we are spilling millions of tons of sewage waters without enough preparation from our towns and our cities. so we are intoxicating the underwater world. another problem here in formentera is this is a main boat destination. thousands of anchors every day goes in the water, and the anchors dragging on the bottom. this is happening underwater and we don't see. i decided to do a detail of cartography, like a scan, of the bottom and to place this cartography on an app that you can download for free, the name is posidonia maps, so you know, if you are over posidoni

the posidonia is giving a lot of things to us.n how to dive, they learn how to do underwater photography. they are learning the things we are doing wrong and how to do in a good way. i don't like to be using an apocalyptic message. the option to change, it's in our hands. if we don't change, maybe in ten years, most of the posidonia here and many species will be gone, but if we start changing, we have the possibility to recover the nature in the mediterranean and in many other places in this planet. that's all for this week. coming up next week: carmen's looking back at some of our best moments injapan, including the time she trained like a ninja. and rajan went to visit what has to be one of the strangest classrooms in the world. join us for that if you can, and in the meantime, don't forget you can keep up with all our adventures on the bbc iplayer. but until next time, from me, ade adepitan, and all the travel show team here in hyde park, it's goodbye. good morning. welcome to breakfast with chris mason and nina warhurst. our h

the posidonia is giving a lot of things to us. that live inside the posidonia jungle. from a small island in the middle of the mediterranean, if we have stable beaches, it's think to the underwater reefs that the posidonia is building along centuries. in this 30 years i'm witnessing how the posidonia is more and more endangered. we are spilling millions of tons of sewage into waters from our towns and our cities. so we are intoxicating the underwater world. another problem here in formentera is it is a boat destination. i think that immigration is really the way to change the future, and it is educating the youth and this is why in the summertime we have hundreds of kids, and they learn how to dive, they learn how to do underwater photography, and they are learning the things we are doing wrong and how to do in a good way. i don't like to be using an apocalyptic message. the option to change, its in our hands. if we don't change and maybe ten years most of the posidonia here and many species will be gone, but if we start changing