Il settimo continente è un’isola di rifiuti

5 dicembre 2007

pubblicato su Carta Quotidiano

Qualcuno lo considera il settimo continente della Terra: galleggia sull’Oceano Pacifico, si invortica su se stesso e soprattutto si espande. Ed è formato da rifiuti.
L’allarme è scattato dopo una foto scattata da Greenpeace Svizzera, mostra un pulcino di albatros morto di fame. Nello stomaco ha plastica, solo plastica. La foto è stata scattata in un luogo al largo delle Hawaii in cui, per il gioco delle correnti, si è formata un’enorme discarica galleggiante di plastica proveniente praticamente da tutto il mondo.


Dopo l’allarme, sono iniziati gli studi. La causa dell’accumulo di rifiuti non è da ricercare solo nelle correnti oceaniche, ma anche nei venti.
Normalmente i materiali scaricati in mare tendano normalmente a disperdersi, in questo caso il doppio effetto di aria ed acqua tende invece a favorire l’accumulo di questa gigantesca isola di rifiuti galleggianti. E stavolta non servono polemiche: è praticamente certo che la causa sia l’uomo, che immette nelle acque quantità di materiali non biodegradabili oltre ogni limite che il buon senso suggerisca.

Il luogo sotto studio è situato ad 800 miglia marittime a nord delle Hawaii, distribuito su una superficie ampia due volte lo stato del Texas.
Avvistata per la prima volta alla metà degli anni ‘90, di dimensioni molto più ridotte, è praticamente cresciuta di circa dieci volte in dieci anni. Qualche ricercatore, anche se l’isola non ha un nome ufficiale, la chiama da tempo «The Great Pacific Garbage Patch».
Sono solo rifiuti della società umana. Non c’è nulla di naturale in quella grande isola. Secondo le stime più recenti, fatte da chi la osserva e la studia, peserebbe approssimativamente 3,5 milioni di tonnellate, con una densità di 3,34 milioni di oggetti di piccole dimensioni per chilometro quadrato, di cui l’80 per cento è plastica.
Non solo.
Essendo localizzata nel Pacifico settentrionale, e studiata la direzione e l’intensità delle correnti, la sua crescita è garantita. Continuerà a crescere, perché le correnti marine ed i venti causano un vortice che spinge in quella zona ogni materia solida galleggiante e leggera. Secondo alcune stime, potrebbe, nel giro di pochi anni, raggiungere un’estensione confrontabile con quella dell’Africa. Pensare ad una bonifica appare per ora impossibile, poiché non si saprebbe dove mettere questa grande mole di rifiuti.

La causa della tardiva scoperta dell’isola di rifiuti è da ricercare certamente nel fatto che si trova in un’area del Pacifico poco attraversata da rotte navali o di pesca.
Di recente, il professor Marcus Eriksen, direttore del «Algatita Marine Research Foundation», ha dichiarato al quotidiano «San Francisco Chronicle» che: «con i venti che si abbassano di colpo, e le correnti che ruotano circolarmente, quello è l’ambiente perfetto per intrappolare i rifiuti».
Tutto accade perché la plastica resiste alla biodegradazione. Con in tempo e la luce, le plastiche sottili sono infatti soggette alla fotodegradazione, le buste e le bottiglie si frantumano in pezzi molto più piccoli, che però mantengono la loro composizione molecolare originale. Che non è biodegradabile. Che non è digeribile, ma viene ovviamente ingerito dalla fauna marina, sia dai pesci sia dagli uccelli, e che come risultato ha una vera e propria strage. Strage di cui siamo tutti responsabili. Strage che può solo crescere nel tempo, se non si affermano immediatamente le bioplastiche sul mercato, e più in generale una revisione dei materiali che usiamo nella vita quotidiana.

Oltre questo, che è già un disastro, c’è dell’altro, in vista per il nostro futuro.
Alcuni ricercatori californiani, di recente, si sono imbattuti in altro grande vortice di correnti, con scarsi venti circolari, situato dal lato opposto del Pacifico, tra le Hawaii e la California. Secondo loro, si potrebbe facilmente accumulare in questa area una seconda grande isola di rifiuti. Già da ora, le premesse ci sono tutte.

58 thoughts on “Il settimo continente è un’isola di rifiuti”

  1. I precisely had to appreciate you again. I am not sure the things I would have undertaken without these techniques shown by you relating to this question. This has been a intimidating condition in my circumstances, nevertheless considering this specialized mode you solved it took me to leap over gladness. I will be happy for the service and thus sincerely hope you know what a powerful job your are undertaking instructing many people through the use of your web blog. Probably you have never come across any of us.

  2. I’m just commenting to let you know of the amazing discovery my friend’s daughter experienced studying the blog. She learned a wide variety of things, most notably what it’s like to possess a very effective teaching character to have many more just thoroughly grasp selected complex subject matter. You undoubtedly surpassed readers’ expected results. Thanks for presenting these informative, trusted, revealing and in addition unique tips about your topic to Evelyn.

  3. I and my buddies were digesting the excellent points on your web blog and immediately got a terrible suspicion I had not thanked the web blog owner for those tips. Most of the women are actually totally glad to read through all of them and have now certainly been having fun with those things. Thanks for genuinely very thoughtful as well as for picking out certain superior tips millions of individuals are really desperate to know about. My honest regret for not expressing appreciation to you earlier.

  4. I’m just commenting to make you be aware of what a perfect experience our child found checking your web page. She learned numerous pieces, not to mention what it is like to have an incredible giving style to let certain people quite simply have an understanding of specific tricky issues. You really surpassed my desires. Thank you for offering those important, healthy, explanatory and in addition easy thoughts on the topic to Ethel.

  5. I in addition to my guys happened to be looking through the great hints from your web page while before long I had a terrible feeling I had not expressed respect to the web blog owner for those tips. All the people became for this reason excited to study them and now have in fact been taking pleasure in these things. Many thanks for truly being considerably thoughtful and also for figuring out such fantastic things millions of individuals are really desirous to know about. Our own honest regret for not expressing gratitude to you sooner.

  6. 9?1???????????!!! ????????????????hpv???70?????? ???????9?hpv????????90?????????????????????????? HPV9?1?????? Gardasil ?? 100 ??????? HPV 16?18?31?33?45?52 ? 58 ?? (??? 90 ???????90-95 ????85-90 ????80-85 ?????????????) 100 ?????????? (???????) ? HPV 6?11 ???? (????? 90 ??????????) ???????????????????? (???????) ??? HPV ????? ????????????????????????????

  7. I wish to convey my gratitude for your kindness supporting men and women that really want help with your situation. Your special dedication to passing the solution all over was amazingly effective and have continuously made guys and women much like me to reach their ambitions. Your new informative key points means so much to me and somewhat more to my office workers. Best wishes; from all of us.

  8. I’m just writing to make you understand of the brilliant encounter my friend’s princess enjoyed reading through your blog. She learned so many issues, which included how it is like to have an excellent giving mindset to get many others without hassle understand a variety of multifaceted things. You truly exceeded my desires. I appreciate you for providing the warm and helpful, dependable, explanatory as well as fun thoughts on your topic to Mary.

  9. I want to show my affection for your kind-heartedness in support of visitors who actually need guidance on the situation. Your real commitment to getting the solution all through has been exceptionally invaluable and have continually made most people like me to achieve their endeavors. Your entire important publication entails this much a person like me and especially to my mates. Thanks a ton; from each one of us.

  10. I would like to voice my gratitude for your kindness for people that really need assistance with the subject matter. Your real commitment to getting the solution all through ended up being unbelievably interesting and has frequently made workers much like me to realize their desired goals. Your personal warm and friendly suggestions indicates so much to me and much more to my fellow workers. Many thanks; from all of us.

  11. New 2018 basketball — [url=http://www.curry-5.com]curry 5[/url]
    [url=http://www.stephencurry-shoes.us]stephen curry shoes[/url]
    [url=http://www.kyrieirvingshoes.us.com]kyrie irving shoes[/url]
    [url=http://www.adidasnmdshoes.us.com]adidas nmd shoes[/url]

  12. I must point out my love for your kind-heartedness for folks who really need guidance on this important study. Your special commitment to passing the message across has been pretty beneficial and has continuously helped guys and women just like me to reach their endeavors. Your new useful guidelines indicates much to me and somewhat more to my fellow workers. Regards; from everyone of us.

  13. I wish to show my gratitude for your kind-heartedness in support of men and women who should have guidance on the topic. Your special commitment to getting the message all over came to be definitely powerful and have continually enabled guys and women just like me to arrive at their objectives. The invaluable instruction signifies a great deal a person like me and still more to my fellow workers. Best wishes; from each one of us.

  14. Thanks a lot for providing individuals with a very splendid chance to check tips from this blog. It’s always so awesome plus stuffed with fun for me personally and my office mates to visit your blog minimum 3 times weekly to learn the latest secrets you will have. And lastly, I am also actually astounded with the breathtaking pointers you serve. Some two facts in this post are undeniably the most suitable we have all ever had.

  15. I must voice my love for your kindness in support of folks who must have guidance on in this theme. Your very own dedication to getting the message along appeared to be really helpful and have all the time permitted individuals just like me to reach their targets. Your invaluable report indicates this much a person like me and substantially more to my peers. Thank you; from everyone of us.

  16. The subsequent time I learn a blog, I hope that it doesnt disappoint me as much as this one. I mean, I do know it was my option to read, but I actually thought youd have something attention-grabbing to say. All I hear is a bunch of whining about something that you would repair in the event you werent too busy looking for attention.

  17. I simply had to appreciate you once more. I’m not certain the things that I would’ve implemented in the absence of the actual secrets shown by you on such a question. It had been a real terrifying concern for me personally, but taking a look at this specialized style you dealt with it forced me to weep for contentment. I am just thankful for the work and even expect you really know what an amazing job you are always undertaking training people today through the use of your web blog. Most probably you haven’t met any of us.

  18. Can I simply say what a relief to seek out someone who really knows what theyre talking about on the internet. You definitely know tips on how to convey an issue to gentle and make it important. More individuals have to learn this and perceive this side of the story. I cant consider youre not more widespread because you definitely have the gift.

  19. I precisely had to appreciate you all over again. I’m not certain the things that I would’ve worked on in the absence of the entire thoughts contributed by you directly on such subject. It previously was the depressing circumstance in my opinion, but spending time with a expert style you resolved the issue made me to cry for joy. I am just happier for the help and even expect you know what a powerful job you happen to be undertaking instructing men and women thru your webblog. Most probably you haven’t met any of us.

  20. I not to mention my pals appeared to be taking note of the best tips and tricks on the blog and then immediately I had a terrible suspicion I had not expressed respect to you for those secrets. All the women ended up totally joyful to read through them and now have in reality been having fun with those things. We appreciate you being considerably accommodating as well as for getting varieties of superior tips most people are really desirous to learn about. My very own honest regret for not saying thanks to sooner.

  21. I precisely desired to say thanks all over again. I am not sure the things that I would’ve undertaken in the absence of the type of creative concepts discussed by you on such question. It had become an absolute intimidating case in my position, nevertheless witnessing a well-written mode you managed the issue made me to weep over happiness. I’m just happy for this service and as well , wish you realize what an amazing job you were getting into teaching the rest by way of a blog. More than likely you’ve never encountered any of us.

  22. I want to point out my gratitude for your kindness supporting those people who really need guidance on this matter. Your special dedication to passing the solution all through became pretty effective and has in most cases enabled most people like me to get to their pursuits. Your personal invaluable help and advice indicates a great deal a person like me and even further to my colleagues. Thank you; from each one of us.

  23. I must show my respect for your kindness in support of folks that really want help with the topic. Your special commitment to getting the message up and down was amazingly beneficial and has truly permitted others just like me to attain their objectives. Your new informative tips and hints signifies this much to me and still more to my office colleagues. Regards; from each one of us.

  24. I want to show my admiration for your generosity in support of those who have the need for help on this study. Your personal dedication to passing the solution across was remarkably productive and have always allowed many people like me to realize their goals. Your personal warm and helpful guideline can mean much a person like me and much more to my colleagues. Thanks a ton; from each one of us.

  25. I would like to show my affection for your kind-heartedness for men and women that need guidance on this particular concern. Your real dedication to getting the message all around turned out to be quite important and have in every case made others much like me to attain their objectives. Your interesting key points entails a lot a person like me and even further to my office workers. Regards; from each one of us.

  26. I simply wanted to thank you very much again. I do not know what I would’ve done without these thoughts provided by you on such a subject matter. It previously was a very traumatic crisis in my view, but noticing a expert form you treated it forced me to weep over gladness. I’m just grateful for the assistance and in addition pray you find out what a great job you happen to be getting into training the rest with the aid of a blog. Most probably you’ve never encountered all of us.

  27. I wish to convey my love for your kind-heartedness for persons who actually need assistance with this particular area. Your very own commitment to passing the message all-around had been astonishingly effective and has specifically permitted individuals much like me to arrive at their endeavors. Your helpful publication indicates so much a person like me and somewhat more to my peers. Many thanks; from each one of us.

  28. I simply desired to appreciate you again. I’m not certain what I would have used without the entire concepts provided by you directly on such topic. It had been a very alarming concern in my position, however , seeing the very professional form you handled that forced me to cry for delight. Now i am happier for the work and as well , believe you realize what a great job you are always accomplishing instructing many people via your web blog. Most probably you’ve never met any of us.

  29. I simply had to thank you so much once more. I am not sure the things I would’ve handled in the absence of the actual basics contributed by you about this area of interest. It was before a terrifying issue in my circumstances, nevertheless spending time with this skilled style you resolved the issue took me to weep for gladness. I’m happy for the assistance and thus wish you comprehend what a great job your are undertaking teaching people today via your blog. More than likely you’ve never got to know all of us.

  30. I must convey my love for your generosity giving support to visitors who actually need help on in this subject matter. Your very own commitment to passing the solution all through became extraordinarily powerful and have without exception made workers just like me to achieve their ambitions. Your own insightful instruction implies a great deal to me and substantially more to my peers. Thanks a lot; from all of us.

  31. I wish to voice my affection for your kind-heartedness supporting visitors who need help on this one area of interest. Your special commitment to passing the solution all around had been rather beneficial and have continually allowed those like me to get to their dreams. The warm and helpful tips and hints indicates a whole lot a person like me and somewhat more to my office colleagues. With thanks; from each one of us.

  32. I and also my pals ended up studying the best tactics from the blog and then unexpectedly developed a terrible suspicion I never expressed respect to the blog owner for those techniques. The women became absolutely thrilled to see all of them and have now simply been using these things. We appreciate you being so accommodating and then for figuring out this form of quality subjects most people are really needing to know about. Our sincere regret for not expressing appreciation to earlier.

  33. I wish to convey my love for your kindness in support of those who have the need for guidance on this important content. Your personal commitment to getting the message throughout was particularly important and have frequently allowed some individuals like me to achieve their desired goals. Your amazing important report indicates a great deal to me and further more to my office colleagues. Warm regards; from each one of us.

  34. I wish to express my admiration for your kind-heartedness supporting those people who actually need assistance with this one niche. Your real commitment to getting the solution all over turned out to be pretty effective and has continually allowed ladies much like me to arrive at their desired goals. This interesting hints and tips indicates a whole lot to me and further more to my fellow workers. Thanks a ton; from all of us.

  35. Thank you for all of the labor on this web page. Debby takes pleasure in setting aside time for investigations and it’s really simple to grasp why. Most people notice all regarding the lively medium you give vital tricks via this blog and even welcome response from the others on this topic then our princess is really being taught a great deal. Take advantage of the rest of the year. You’re the one conducting a first class job.

  36. I wish to point out my appreciation for your generosity giving support to folks that must have guidance on this issue. Your personal dedication to getting the message throughout had been quite powerful and have specifically helped folks like me to achieve their goals. Your amazing valuable instruction means much to me and somewhat more to my peers. Thanks a ton; from each one of us.

Leave a Reply to http://www.myvibor.ru/narco.php Cancel reply

Your email address will not be published. Required fields are marked *