http://www.enn.com/ ENN RSS News http://www.enn.com/ecosystems/article/43972 Slash-and-burn agricultural practices, banned by governments because of the risk of uncontrolled fires, provide better growing conditions for valuable new trees than more modern methods of forest clearance, a study suggests. http://www.enn.com/ecosystems/article/43970 Clues to how life evolved, not only on this planet but also possibly on alien worlds, might be found in underwater caves in the Bahamas, researchers say. The caves in question are called "blue holes," so-named because from the air, their entrances appear circular in shape, with different shades of blue water in and around them. There are estimated to be more than 1,000 such caves in the Bahamas, the greatest concentration of blue holes in the world. http://www.enn.com/wildlife/article/43964 Evidence that jellyfish are taking over the oceans is currently lacking, according to a new study published in Bioscience. Complied by a number of marine experts, the study found that while jellyfish have been on the rise in some regions it is likely due to a natural cycle of jellyfish populations and not a global boom. Researchers, including a number of marine biologists, have warned for years that jellyfish numbers may be exploding due to human activities, such as overfishing, warmer oceans due to global climate change, and the rise of oxygen-depleted, so-called "dead zones." http://www.enn.com/wildlife/article/43962 Pointing out the similarities (and differences) between slavery and the use of fossil fuels can help us engage with climate change in a new way, says Jean-François Mouhot, visiting researcher at Georgetown University, USA. In 2005, while teaching history at a French university, I was struck by the general disbelief among students that rational and sensitive human beings could ever hold others in bondage. Slavery was so obviously evil that slave-holders could only have been barbarians. My students could not entertain the idea that some slave-owners could have been genuinely blind to the harm they were doing. At the same time, I was reading a book on climate change which noted how today's machinery — almost exclusively powered by fossil fuels like coal and oil — does the same work that used to be done by slaves and servants. "Energy slaves" now do our laundry, cook our food, transport us, entertain us, and do most of the hard work needed for our survival. http://www.enn.com/ecosystems/article/43956 After 20 years of drilling, a team of Russian researchers is close to breaching the prehistoric Lake Vostok, which has been trapped deep beneath thick ice layers (2 miles thick) in Antarctica for the last 14 million years. Lake Vostok is actually the third largest lake in the world, measured by the amount of water it holds. In the early 1990s, the Russians re-created a history of the Earth's atmosphere throughout the past 400,000 years — a record of our planet's air during the past four ice ages. The lakes are rich in oxygen (making them oligotrophic), with levels of the element some 50 times higher than what would be found in your typical freshwater lake. The high gas concentration is thought to be because of the enormous weight and pressure of the continental ice cap. http://www.enn.com/ecosystems/article/43948 Yellow-cedar, a culturally and economically valuable tree in southeastern Alaska and adjacent parts of British Columbia, has been dying off across large expanses of these areas for the past 100 years. But no one could say why. "The cause of tree death, called yellow-cedar decline, is now known to be a form of root freezing that occurs during cold weather in late winter and early spring, but only when snow is not present on the ground," explains Pacific Northwest Research Station scientist Paul Hennon, co-lead of a synthesis paper recently published in the February issue of the journal BioScience. "When present, snow protects the fine, shallow roots from extreme soil temperatures. The shallow rooting of yellow-cedar, early spring growth, and its unique vulnerability to freezing injury also contribute to this problem." http://www.enn.com/wildlife/article/43945 In January of this year, a comprehensive study of animals in the Southern Ocean was completed, showing that the region is under threat from climate change. The scientific journal Deep Sea Research Part II: Topical Studies in Oceanography featured the findings of an international group of researchers who wrote over 20 papers about the effects on the Scotia Sea food web by above average water temperatures. http://www.enn.com/ecosystems/article/43943 Tunis, Tunisia: A remote seasonal salt lake on the edge of the Sahara leads a list of 15 new Ramsar Wetlands of International Importance being declared in the country on World Wetlands Day, February 2. Chott Elguetar, a 7,400 ha site with an intermittent lake, is vital to the survival of the threatened Scimitar Oryx, Addax and Dama Gazelle. It also contains traces of human religious and industrial activity that have been dated back 40,000 years. http://www.enn.com/ecosystems/article/43940 It's good news for the human environment. The UPS Foundation today announced almost 120 grants totaling more than $6 million to non-profit organizations around the world that champion diversity and support diverse communities. For more than 60 years, UPS's philanthropic arm has funded organizations that support under-served and under-represented members of society. This year’s grants will support a wide range of programs, including those for wounded veterans, the hearing and visually-impaired, women and girls and culturally distinct populations. http://www.enn.com/ecosystems/article/43938 New research led by scientists from Oxford University and Exeter University has shown that the invasion of the land by plants in the Ordovician Period (488-443 million years ago) cooled the climate and may have triggered a series of ice ages. During this period sea levels are very high and at the end of the period there was a mass extinction event. At the beginning of the period, around 480 million years ago, the climate was very hot due to high levels of CO2, which gave a strong greenhouse effect. The marine waters are assumed to have been around 45°C, which restricted the diversification of complex multi-cellular organisms. But over time, the climate become cooler, and around 460 million years ago, the ocean temperatures became comparable to those of present day equatorial waters. The dramatic cooling of the planet between 300 and 200 million years ago was also the result of the evolution of large plants with large rooting systems that caused huge changes in both of these processes. In the current results it was shown that the appearance of the first land plants had a similar effect and much earlier in time. http://www.enn.com/ecosystems/article/43936 Conservationists working in Central Africa to save the world's rarest gorilla have good news: the Cross River gorilla has more suitable habitat than previously thought, including vital corridors that, if protected, can help the great apes move between sites in search of mates, according to the North Carolina Zoo, the Wildlife Conservation Society, and other groups. http://www.enn.com/wildlife/article/43934 Non-native Burmese pythons are believed to be the cause of severe mammal declines in the Florida Everglades, according to new research. Also known as the Asiatic rock python, the Burmese python (Python molurus bivittatus) is a large constricting snake native to Asia. The exact origins of the pythons in the Everglades are unknown, but many have been imported into the United States through the pet trade, and some are likely to have escaped or been released into the wild. In the absence of natural predators, the Burmese python population has exploded. Since 2000 the species has been recognised as being established across large parts of southern Florida, where it is known to eat a wide variety of mammals and birds. http://www.enn.com/ecosystems/article/43924 WASHINGTON— The U.S. Forest Service today released a new proposal for the nation's 193-million-acre national forest system that will weaken rules protecting fish and wildlife from logging, livestock grazing, mining and off-road vehicles. The new proposal, which was released as part of the final environmental impact statement for the rule, is the Forest Service's fourth attempt since 2000 to revise nationwide regulations governing national forests. All three previous attempts were challenged in court by the Center for Biological Diversity and allies, and all three prior attempts were found unlawful. Like the 2000, 2005 and 2008 rules, the Obama administration's planning rule would decrease longstanding protections for wildlife on national forests. http://www.enn.com/ecosystems/article/43920 Gulf countries that lack freshwater resources rely deeply on seawater desalination to meet their daily needs and cool down thermal generation plants. According to Gulf News, the United Arab Emirates alone uses four trillion litres of Gulf seawater each year to cool down its power plants, foundries and desalination plants. The byproduct of these operations produces a hot briny fluid that is then pumped back into the Gulf, seriously compromising coral reefs and the overall marine ecosystem. But Crystal Lagoons — the same people who were behind the worlds largest artificial lagoon planned for the Red Sea, is marketing a new closed-loop cooling system that would ensure that no more water would have to be extracted from the Gulf to cool down industrial plants! Thermal power plants require water for cooling, but disposing of that water back into the Gulf is not only harmful to the marine ecosystem, according to Crystal Lagoons, it is also a waste of thermal energy. http://www.enn.com/wildlife/article/43916 Biodiversity loss is probably a challenge that is often ignored as climate change looms. Currently the world is losing species at a rate that is 100 to 1000 times faster than the natural extinction rate, further, it is currently seeing the sixth mass extinction. The previous mass extinction occured 65 million years ago, and was caused by ecosystem changes, changes in atmospheric chemistry, impacts of asteroids and volcanoes. For the first time in history, the current extinction is caused by the competition for resources between a single species Homo sapiens and all others. A recent conference arranged by the Danish Ministry of Environment in the University of Copenhagen, provided an opportunity to influence the process of organizing a UN Biodiversity Panel. More than 100 scientists and decision makers from the EU countries gathered and came to the conclusion that drastic measures should be taken to decelerate current loss of biodiversity. http://www.enn.com/ecosystems/article/43910 Even after 100 years have passed a restored wetland may not reach the state of its former glory. A new study in the open access journal PLoS Biology finds that restored wetlands may take centuries to recover the biodiversity and carbon sequestration of original wetlands, if they ever do. The study questions laws, such as in the U.S., which allow the destruction of an original wetland so long as a similar wetland is restored elsewhere. http://www.enn.com/ecosystems/article/43907 The fish stocks of the southern Pacific and in particular Peru are being plundered by widespread cheating and overfishing, according to a new investigation. Peru is the world's second largest fishing nation after China, with the majority of its catch converted into fishmeal, a feed for farmed fish and pigs. More than a million tons a year exported mostly to Asia, in a trade worth $1.6 billion. http://www.enn.com/ecosystems/article/43900 People exposed to very high levels of arsenic in Chilean drinking water back in the 1950s and 60s are still showing a higher-than-normal risk of bladder cancer -- years after the arsenic problem was brought under control, a new study shows. The findings are not surprising, researchers say, since the cancer would take decades to emerge. But the results underscore the importance of continuing to screen high-risk people for bladder cancer, according to lead researcher Dr. Fernando Coz, a professor of urology at the Universidad de Los Andes in Santiago de Chile. The study, reported in the Journal of Urology, focused on people in the Antofagasta region of Chile. In the 1950s and 60s, drinking water in the region became contaminated with high levels of arsenic. Arsenic is semi-metallic element found in rock, soil, water and air. It is also released into the environment through industrial activities, and can be found in products like paints, dyes and fertilizers. High exposure has been linked to several cancers, including tumors of the bladder, liver and lungs. http://www.enn.com/ecosystems/article/43894 In geology, permafrost, cryotic soil or permafrost soil is soil at or below the freezing point of water (0 °C or 32 °F) for two or more years. Ice is not always present, as may be in the case of nonporous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material. A pioneering airborne electromagnetic survey in the Yukon Flats near Fort Yukon, Alaska, by the U.S. Geological Survey has yielded unprecedented images of the presence and absence of permafrost to depths of roughly 328 feet. The airborne survey captured images of permafrost over a substantially larger area, and with greater data density, than has been previously achieved using sparse boreholes and ground-based geophysics. http://www.enn.com/ecosystems/article/43892 Duke University researchers have predicted that climate change in California will result in a declining percentage of rangeland. Such a change will have widespread impact on the state's large cattle industry of California's Central Valley. No matter if climate change will cause wetter or drier weather, available pasture will decline. Forage areas, known as one of nature's free services, may no longer be so free. The grasses will either wither as arid conditions creep north, or be pushed out as inedible shrubs and brush take over. http://www.enn.com/ecosystems/article/43889 A huge pool of fresh water in the Arctic Ocean is expanding and could lower the temperature of Europe by causing an ocean current to slow down, British scientists said Sunday. Using satellites to measure sea surface height from 1995 to 2010, scientists from University College London and Britain's National Oceanography Center found that the western Arctic's sea surface has risen by about 15 cms since 2002. The volume of fresh water has increased by at least 8,000 cubic km, or about 10 percent of all the fresh water in the Arctic Ocean. The fresh water comes from melting ice and river run-off. The rise could be due to strong Arctic winds increasing an ocean current called the Beaufort Gyre, making the sea surface bulge upwards. The Beaufort Gyre is one of the least understood bodies of water on the planet. It is a slowly swirling body of ice and water north of Alaska, about 10 times bigger than Lake Michigan in the United States. Some scientists believe the natural rhythms of the gyre could be affected by global warming which could have serious implications for the ocean's circulation and rising sea levels. http://www.enn.com/ecosystems/article/43886 Italy risks its worst environmental disaster in more than two decades if the 2,400 tonnes of thick fuel in the capsized Costa Concordia pollutes one of the Mediterranean's most prized and pristine maritime reserves. Seven days after the 114,500 tonne liner capsized off the Tuscan coast, its vast wreck is shifting precariously on an undersea ledge, threatening to slide further and undermining plans to pump the oil out safely. The ship keeled over after striking a rock and is now lying on its side on a shelf in about 20 meters of water off the little island of Giglio. Eleven people were killed and 21 are still unaccounted for. With hopes of finding any survivors all but gone, experts warn that beyond the loss of lives, this could turn into Italy's worst maritime environmental emergency since the sinking of the Amoco Milford Haven, loaded with 144,000 tonnes of oil, off the coast of Genoa in 1991. The clean up of that area was completed in 2008, 17 years after the accident, and the Haven shipwreck is still on the seabed, said Luigi Alcaro, head of maritime emergencies at ISPRA, Italy's government agency for the environment. http://www.enn.com/ecosystems/article/43880 The global average temperature last year was the ninth-warmest in the modern meteorological record, continuing a trend linked to greenhouse gases that saw nine of the 10 hottest years occurring since the year 2000, NASA scientists said on Thursday. A separate report from the U.S. National Oceanic and Atmospheric Administration (NOAA) said the average temperature for the United States in 2011 as the 23rd warmest year on record. The global average surface temperature for 2011 was 0.92 degrees F (0.51 degrees C) warmer than the mid-20th century baseline temperature, researchers at NASA's Goddard Institute for Space Studies said in a statement. The institute's temperature record began in 1880. The first 11 years of the new century were notably hotter than the middle and late 20th century, according to institute director James Hansen. The only year from the 20th century that was among the top 10 warmest years was 1998. http://www.enn.com/ecosystems/article/43874 The Obama administration on Wednesday rejected the Keystone crude oil pipeline project, a decision welcomed by environmental groups but blasted by the domestic energy industry. U.S. President Barack Obama said TransCanada's application for the 1,700-mile (2,740-km) pipeline was denied because the State Department did not have enough time to complete the review process. "This announcement is not a judgment on the merits of the pipeline, but the arbitrary nature of a deadline that prevented the State Department from gathering the information necessary to approve the project and protect the American people," Obama said in a statement. http://www.enn.com/wildlife/article/43867 Israeli agro-biotechnology company, Rosetta Green, has developed a new technology to develop plants that are better able to withstand prolonged periods of severe drought. The company aims to develop new plant varieties resistant to harsh climatic condition, maintaining an increased yield. The company, based in Rehovot, Israel, experimented on tobacco plants that were irrigated with seawater instead of freshwater. The genetically modified plants created by the company were able to grow under seawater irrigation, as opposed to the control group of plants. According to the company's CEO, Amir Avniel, "the frequent droughts afflicting the world in recent years and the motivation to expand to arid lands containing brackish water require the development of plant varieties resistant to drought and irrigation with salt water." Rosetta Green is using a technology that can identify MicroRNAs, which are short RNA molecules that play an important role in the regulation of key genetic traits in major crops. The MicroRNAs identified by the company were used to develop prototype plants with significantly improved drought tolerance.