1 janvier 2018 0 Commentaire



Album : ashley

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We must also learn to support others if we want to move forward

Ashley Cooper  runs https://lnkd.in/gXkumw8 the world’s only climate change photo agency. His book « Images From a Warming Planet » is out now and available from https://lnkd.in/gjvuyyR An art photographic book with foreword by Jonathon Porritt, it contains the best 500 images from the last fourteen years documenting the impacts of climate change on every continent on the planet.


Good Work ! Big Up.


27 décembre 2017 0 Commentaire

Documentaire Incroyable et Rare.

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Je vous le conseil vivement.

15 décembre 2017 0 Commentaire

3 Incredible Inventions That Are Cleaning Our Oceans



Album : pollution

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Incroyable article :


Par Madame :


Carla Herreria


The research is clear: Man-made pollution is choking the oceans. From plastics that swirl around the world trashing beaches and killing marine animals, to chemical and oil spills that poison the sea, humans are to blame for much of the oceans’ deteriorating health.

Fortunately for our planet, some people have dedicated themselves to reversing mankind’s mistakes. In honor of World Oceans Day Thursday, HuffPost is highlighting groundbreaking inventions that were designed to take care of the sea.


While these solutions won’t entirely solve the world’s pollution problem ― real change can only happen when humans drastically change their consumption and plastic production habits ― the projects featured below are a good place to start.

1. This genius bucket that sucks trash and oil out of the sea

2. Boyan Slat’s ambitious plan to clean the Great Pacific Garbage Patch.

3. This technology that turns plastic waste into oil


14 décembre 2017 0 Commentaire

Un «trou» grand comme trois fois la Bretagne découvert en Antarctique

Un « trou » au milieu de l’Antarctique qui préoccupe les scientifiques. Une étendue d’eau de 80.000 km², soit trois fois la superficie de la Bretagne, a été découverte le mois dernier en pleine banquise dans la mer de Weddell, une partie de l’océan Austral presque entièrement recouverte de glace.

Un phénomène que les chercheurs peinent à expliquer. « C’est un trou assez remarquable », pour le physicien de l’atmosphère Kent Moore, professeur à l’université de Toronto à Mississauga. « C’est comme si on avait mis un coup de poing dans la glace », explique-t-il au site Motherboard.

 Si on n’avait pas de satellite, on ne saurait pas qu’il existe »

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Ces étendues d’eau entourées de glace sont appelées polynies. Elles peuvent être formées par des remontées d’eau chaude à la surface (notamment à cause des courants marins) ou par des vents, mais on les observe généralement près du littoral, note Kent Moore, alors que le phénomène qui intrigue actuellement les scientifiques est localisé loin dans la banquise. « C’est à des centaines de kilomètres de la lisière. Si on n’avait pas de satellite, on ne saurait pas qu’il existe ». Autre particularité : sa taille. Les polynies peuvent habituellement atteindre quelques centaines de km², très loin de ce « monstre » de 80.000 km².

Une polynie avait déjà été observée dans la même zone de la mer de Weddell dans les années 1970, que les moyens de l’époque n’avaient pas permis d’étudier de près, selon Kent Moore. Après avoir disparu pendant quarante ans, le « trou » est revenu l’an dernier pour quelques semaines. Puis de nouveau cette année.

Parmi les possibles causes de la formation de ce phénomène, l’hypothèse du réchauffement climatique est avancée, mais les chercheurs ne souhaitent pas tirer de conclusions prématurées. Les possibles conséquences sur l’océan Austral et le climat de l’Antarctique ne sont pas non plus connues. A ce stade, « on ne comprend pas vraiment l’impact à long terme qu’auront les polynies », avoue Kent Moore.


12 décembre 2017 0 Commentaire

Heart monitors on wild narwhals reveal alarming responses to stress

After their release, narwhals made a series of deep dives, swimming hard to escape, while their heart rates dropped to shockingly low levels (3 to 4 beats per minute). This put them in danger of not getting enough oxygen to the brain and other critical organs.
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Narwhals released after entanglement in nets and outfitted with heart monitors performed a series of deep dives, swimming hard to escape, while their heart rates dropped to unexpectedly low levels of three to four beats per minute. This combination of hard exercise and low heart rate while not breathing under water is costly and could make it difficult for the deep-diving whales to get enough oxygen to the brain and other critical organs, according to a new study.

« How do you run away while holding your breath? These are deep-diving marine mammals, but we were not seeing normal dives during the escape period. I have to wonder how narwhals protect their brains and maintain oxygenation in this situation, » said Terrie Williams, a professor of ecology and evolutionary biology at UC Santa Cruz who has studied exercise physiology in a wide range of marine and terrestrial mammals.

Williams is first author of a paper on the new findings published December 8 in Science. Narwhals, known as « unicorns of the sea » for the large tusks on the males, live year-round in Arctic waters. They have been relatively isolated from human disturbances until recently, when declines in Arctic sea ice have made the region more accessible to shipping, oil exploration, and other human activities.

Narwhals monitored after release gradually returned to more typical behavior and normal heart rates. But Williams said she worries that the stress from human disturbances could cause behavioral responses in narwhals that are inconsistent with their physiological capacities. Their natural escape response to avoid killer whales and other threats typically involves moving slowly either to great depths or into shallow coastal areas beneath ice cover where killer whales can’t follow. « This is not a speedy animal, » she explained.

A decreased heart rate (called bradycardia) is a normal part of the mammalian dive response, along with other physiological changes to conserve oxygen. In narwhals, the researchers measured resting heart rates at the surface of about 60 beats per minute. During normal dives (after the escape period), their heart rates dropped to between 10 and 20 beats per minute, depending on exercise level. Heart rate normally rises with increased exercise, even during a dive.

« That’s what is so paradoxical about this escape response — it seems to cancel out the exercise response and maintains extreme bradycardia even when the whales are exercising hard, » Williams said.

The extremely low heart rates that Williams observed in fleeing narwhals are similar to those seen in animals with a « freeze reaction, » one of two mutually exclusive responses animals can have to perceived threats, the other being a « fight or flight » response that revs up heart rate and metabolism. The narwhals, in their response to a stressful situation, seem to combine elements of a physiological freeze reaction with a behavioral flight reaction, with potentially harmful consequences.

« For terrestrial mammals, these opposing signals to the heart can be problematic, » Williams said. « Escaping marine mammals are trying to integrate a dive response on top of an exercise response on top of a fear response. This is a lot of physiological balancing, and I wonder if deep-diving marine mammals are designed to deal with three different signals coming to the heart at the same time. »

The same phenomenon may occur in other deep-diving whales when they are disturbed by human-generated noise in the oceans, which has been associated with strandings of deep-diving cetaceans such as beaked whales, she said.

« The disorientation often reported during strandings of deep-diving whales makes me think something has gone wrong with their cognitive centers, » Williams said. « Could this result from a failure to maintain normal oxygenation of the brain? »

She calculated that the escape dives her team monitored in narwhals required 97 percent of the animal’s oxygen supply and often exceeded its aerobic dive limit (meaning depletion of oxygen stores in the muscles, lungs, and blood, followed by anaerobic metabolism). Normal dives of similar duration and depth used only about 52 percent of a narwhal’s oxygen store, the study found.

The study was conducted in Scoresby Sound on the east coast of Greenland, where coauthor Mads Peter Heide-Jørgensen, a research professor at the Greenland Institute of Natural Resources, has been studying narwhals since 2012. Native hunters in the area set out nets to catch fish, seals, and other animals, including narwhals. Heide-Jørgensen developed a collaboration with the hunters to allow scientists to tag and release narwhals caught in the nets. He has been using satellite tags to study the movements of the East Greenland narwhal population.

Williams’s group at UC Santa Cruz developed unique tagging technology for marine mammals that enables researchers to monitor exercise physiology during dives by recording electrocardiograms, swimming movements (stroke rates), and other data. The tags function much like the Fitbits people use to monitor their daily activities. For this study, resting heart rate was measured in nine narwhals, and five were monitored during dives after release. The instruments were attached to the narwhals with suction cups and fell off after one to three days, floating to the surface where they could be recovered by the scientists.

In previous studies, Williams has used the instruments to study exercise physiology and dive responses in bottlenose dolphins, Weddell seals, and other species. « This was our first opportunity to put the tags on a deep-diving whale to monitor its physiological and behavioral responses, » Williams said. « It all began with the work on dolphins in our facilities at Long Marine Laboratory. »

Among the findings of her earlier studies was a surprising frequency of heart arrhythmias in dolphins and seals during intense exercise at depth. The new findings add to her concerns about the effects of disturbances that cause an escape response in deep-diving marine mammals.

« Unlike threats from predators like killer whales, noise from sonar or a seismic explosion is difficult to escape. Problems can start if the whales try to outrun it, » Williams said. « The implications of this study are cautionary, showing that the biology of these animals makes them especially vulnerable to disturbance. This technology has given us a window into the narwhal’s world, and what we see is alarming. The question is, what are we as humans going to do about it? »

In addition to Williams and Heide-Jørgensen, the coauthors of the paper include Susanna Blackwell of Greeneridge Sciences in Santa Barbara, California; Beau Richter at UC Santa Cruz; and Mikkel-Holger Sinding at the Natural History Museum of Denmark, University of Copenhagen. This work was funded by the U.S. Office of Naval Research and National Science Foundation and the Greenland Institute of Natural Resources.

12 novembre 2017 0 Commentaire

Green Chalenge Evenement – Membre du Jury – Casablanca Maroc

Green Chalenge Evenement – Membre du Jury – Casablanca Maroc
Green challenge
Album : Green challenge

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Green challenge 2017, l’événement environnemental par excellence est aussi l’occasion de connaître et rencontrer des personnalités qui œuvrent dans la sensibilisation et l’éducation à l’environnement.

Inviter en tant que membre du jury pour juger les multiples travaux exposer par des bénévole pour l’environnement ( un geste pour l’environnement).

En collaboration avec l’association Vision Verte de Casablanca.


13 mai 2017 0 Commentaire

Rose et la Baleine – Chez – Edilivre – Paris

Rose et la Baleine –  Chez –  Edilivre – Paris


rose et la baleine
Album : rose et la baleine

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Ce petit livre est le fruit d’une expérience qui a été menée avec des enfants et des pédopsychiatres. Son but est est d’inculquer aux jeunes générations une profonde compréhension des océans, en utilisant des illustrations chaleureuses et colorées.

Les questions que se posent les enfant ne sont pas toujours simples et les réponses ne sont pas toujours faciles à donner. À travers ce livre, nous avons essayé de simplifier le discours que nous pouvons leur transmettre. C’est une nouvelle manière d’éduquer nos enfants à l’environnement marin, en répondant à des questions récurrentes sur la mer.


12 janvier 2017 0 Commentaire

Photo depuis ISS

Photo depuis ISS

Une partie de La Grande Barrière de corail photographiée à 400 km, par Thomas Pesquet depuis l’ISS.
Une merveille de la nature qu’il faut protéger.15894734_10154324002025838_6602906159027171878_n




14 décembre 2015 0 Commentaire

Omega Project -NASA- USA

Omega Project -NASA- USA
Album : nasa

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The OMEGA photo-bioreactors float in seawater, and are filled with waste water, which is basically freshwater, and means that there is a salt gradient between the waste water inside the OMEGA and the surrounding seawater. We use this gradient to clean the waste water. Here’s how:

There are special water permeable membranes that selectively let water through and keep back almost everything else. This gives them some really interesting uses. For example, if we put one of these membranes between the two sides of a U-shaped tube, and we put salt in one side of the tube to form a concentrated salt solution called brine, the brine, which cannot pass through the membrane, forms a chemical gradient that pulls the water on the left side of the U-tube through the membrane into the brine on the right side of the tube. This process is called forward osmosis (or just osmosis).

Suite à une consultation des services de la NASA, j’ai pu répondre au développement de ce projet qui consiste a dépolluer l’eau de mer à l’aide d’un processus de filtration par les algues, j’étais consulter pour construire l’offshore qui serviras comme support en mer pour la dépollution

nommée ambassadeur de ce projet en nord de l’Afrique par le directeur Johnathan trent.


12 décembre 2015 0 Commentaire

Ateliers sur la plongée et l’exploration sous marine pour Enfants -CAF Francais- Maroc

Ateliers sur la plongée et l’exploration sous marine pour Enfants -CAF Francais- Maroc


Ateliers pour enfants CAF
Album : Ateliers pour enfants CAF

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Ateliers pour enfants au sein du centre d’amitiés franco-marocain sis Casablanca .

Initiation à la biologie marine, l’exploration des fonds marins, et la plongée sous marine responsable, en protégeant l’environnement marin.

Reconnaissance globale des espèces rencontrés et leurs comportements.


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