Alertar para a necessidade de vigilância contra as grandes catástrofes, sejam elas naturais ou conseqüência do comportamento humano, e a importância da Sustentabilidade e cuidados com o Meio Ambiente.
COVID e Educação, EAD, Teletrabalho e os impactos ambientais e sociais.
Algumas fotos em slide da Antiga Fábrica de Chumbo em Santo Amaro-BA. Lá encontramos riquezas de uma história na qual para muitas famílias não são tão boas recordações visto tê-las prejudicado física e emocionalmente. Mas historicamente sim ela é notável em uma época memorável.
Durante quase cinquenta anos, a cidade da região do Vale da Ribeira viveu em função da exploração do chumbo. Hoje, a contaminação ambiental no lugar ainda é grande. Pesquisadores da UFPR (Universidade Federal do Paraná) dizem que ela atinge a terra, as pastagens e o gado, comprometendo a saúde da população.
A ten minute web-based film explaining how mercury enters the seafood we eat, why eating low-mercury fish is important for good health, and the need to keep mercury out of the environment. Learn more at http://www.dartmouth.edu/~toxmetal
The half-hour documentary presents the many benefits of eating ocean fish and weighs those benefits against the risk of mercury exposure for the population with the most to gain (or lose): unborn and young children. Pregnant and nursing mothers will learn why two ocean fish meals a week during the critical window of development can safely give their babies lifelong benefits. The rest of the population also benefits by including ocean fish in their healthy diets.
"Fish really is brain food," said Laura Raymond, Research Manager, at the EERC. "Concerns about mercury exposure have led to reduced seafood consumption, resulting in negative health consequences because the nutritional benefits from fish consumption are often overlooked. But in recent years, experts have learned that fish consumption is important to pregnant women and babies as well as good for your heart and brain."
Ocean fish are an important source of many nutrients. They are rich in omega-3s; vitamins D and E; and minerals like iodine, calcium, and selenium. Ocean fish provide the important nutrients for strong bones, brain development, and a healthy immune system.
"This documentary explores the simple question: How much fish should I eat?" said EERC Director Gerald Groenewold. "Humankind has relied on fish for food since the dawn of time. However, people are understandably concerned about mercury. Because of those worries, people run the risk of missing out on the important nutrients that ocean fish and other seafood provide. This program presents key information to evaluate the role of seafood in our diets and clarifies the risk of mercury from fish consumption," he said.
The program traces the health concerns stemming from rare cases of mercury poisoning, subsequent population studies of seafood consumption and childhood development, government guidelines about fish in the diet, and research by the EERC and other institutions regarding the relationship of mercury and selenium.
"The EERC is breaking new ground in studying the relationship between mercury and selenium," Groenewold said. "Our research confirms that mercury has the ability to combine with selenium, forming a bond that will not break. This selenium--mercury bond is key to mitigating mercury toxicity risks. Since nearly all ocean fish naturally contain much more selenium than mercury, they are safe to eat," he said.
Funding for the documentary is provided by the National Oceanic and Atmospheric Administration Marine Fisheries Pacific Islands Regional Office and the members of Prairie Public.
Doctors warn against eating too much fish because of the risk of ingesting mercury, but how does mercury get into fish in the first place?
How Does Mercury Get Into Fish? http://www.scientificamerican.com/art... “Mercury in the fish we like to eat is a big problem in the United States and increasingly around the world. Mercury itself is a naturally occurring element that is present throughout the environment and in plants and animals.“
Synthetic coral could remove toxic heavy metals from the ocean http://www.eurekalert.org/pub_release... “A new material that mimics coral could help remove toxic heavy metals like mercury from the ocean, according to a new study published in the Journal of Colloid and Interface Science.”
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Life on earth is protected from the UV rays by a layer in the upper atmosphere (known as the stratosphere), which surrounds earth. This layer is called the Ozone layer.
Ozone is a gas made up of three oxygen atoms (O3) much like the layer of butter that settles on top if a glass of buttermilk is left unattended for a while.
This layer is just about 3-5mm thick. This thinly spread-out gas has been protecting life near the earth’s surface from the sun’s harmful UV rays for billions of years.
Ozone is spread thinly throughout the stratosphere in low quantities.
Watch this animated video to understand Why is the ozone layer in danger? and What is the ozone hole?
No sunbathing without sunscreen - that was a mantra for sun worshippers back in the 1980s. The reason: The sun's dangerous UV-radiation passes through massive holes in the Earth's ozone layer and strikes the Earth surface - and our skins - nearly unhindered. Today, we are still busy drenching ourselves in suncream, but it's got quiet about ozone holes. Just what happened to them?
In 2015, the annual Antarctic ozone hole area was larger and formed later than in recent years. The ozone hole expanded to its peak of 28.2 million square kilometers (10.9 million square miles) on Oct. 2, 2015, while last year reached maximum at 24.1 million square kilometers (9.3 million square miles) on Sept. 11, 2014. Compared to the 1991-2014 period, the 2015 ozone hole average area was the fourth largest.
Credit: NASA Goddard Space Flight Center Narrator/Producer: Sophia Roberts (USRA) Scientist: Paul Newman (NASA/GSFC) Writer: Audrey Haar (Telophase Corp.)
The Antarctic ozone hole reached its annual peak size on Sept. 11, according to scientists from NASA and the National Oceanic and Atmospheric Administration (NOAA). The size of this year’s hole was 24.1 million square kilometers (9.3 million square miles) — an area roughly the size of North America.
With the increased atmospheric chlorine levels present since the 1980s, the Antarctic ozone hole forms and expands during the Southern Hemisphere spring (August and September). The ozone layer helps shield life on Earth from potentially harmful ultraviolet radiation that can cause skin cancer and damage plants.
The Montreal Protocol agreement beginning in 1987 regulated ozone depleting substances, such as chlorine-containing chlorofluorocarbons and bromine-containing halons. The 2014 level of these substances over Antarctica has declined about 9 percent below the record maximum in 2000.
“Year-to-year weather variability significantly impacts Antarctica ozone because warmer stratospheric temperatures can reduce ozone depletion,” said Paul A. Newman, chief scientist for atmospheres at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Scientists are working to determine if the ozone hole trend over the last decade is a result of temperature increases or chorine declines. An increase of stratospheric temperature over Antarctica would decrease the ozone hole’s area.
The study indicates that under the frigid weight of Barents Sea Ice sheet, which covered northern Eurasia some 22 000 years ago, significant amounts of methane may have been stored as hydrates in the ground. As the ice sheet retreated, the methane rich hydrates melted, releasing the climate gas into the ocean and atmosphere for millennia. This finding was published in January 2016 in Nature Communications, publication "Ice-sheet-driven methane storage and release in the Arctic"
Arctic sea ice has not only been shrinking in surface area in recent years, it’s becoming younger and thinner as well. In this animation, where the ice cover almost looks gelatinous as it pulses through the seasons, cryospheric scientist Dr. Walt Meier of NASA Goddard Space Flight Center describes how the sea ice has undergone fundamental changes during the era of satellite measurements.
Editor’s note: This visualization incorrectly identifies the oldest ice as being 5+ years old, when it would be more accurate to say 4+ years old. An updated version of this visualization can be downloaded in HD here: http://svs.gsfc.nasa.gov/4510
Credit: NASA’s Goddard Space flight Center/Jefferson Beck
This video is public domain and along with other supporting visualizations can be downloaded from the Scientific Visualization Studio at: http://svs.gsfc.nasa.gov/4510
