Study reveals new method to estimate the global impacts of dams
January 7, 2015 04:08 PM - McGill University
When dams are built they have an impact not only on the flow of water in the river, but also on the people who live downstream and on the surrounding ecosystems. By placing data from close to 6,500 existing large dams on a highly precise map of the world’s rivers, an international team led by McGill University researchers has created a new method to estimate the global impacts of dams on river flow and fragmentation.
Lake Erie dead zone increased drastically by 2012 drought
January 7, 2015 08:19 AM - Carnegie Science
Lake Erie just can’t catch a break. The lake has experienced harmful algal blooms and severe oxygen-depleted “dead zones” for years, but now a team of researchers led by Carnegie’s Anna Michalak and Yuntao Zhou has shown that the widespread drought in 2012 was associated with the largest dead zone since at least the mid-1980s.
Until now, the size of the dead zone each summer and the factors explaining the variability from year to year have been elusive. Using 28 years of data collected in and around the lake, the team was able to “measure” the size of the dead zone each summer and identify factors that explain the year-to-year variability for the first time. They found that the 2012 drought, with extremely low water inflow from tributaries, was associated with a record-breaking dead zone in the lake, and that meteorological factors together with agricultural practices explain why these events vary annually. Previous studies have focused on phosphorous from agricultural runoff as the primary driver of the lake’s dead zones, but this analysis shows that the inflow of water from tributaries is actually the largest explanatory factor. The results are published in Environmental Science & Technology.
European Environmental Agency finds air pollution the leading environmental cause of death
January 6, 2015 08:32 AM - EurActiv
Responsible for 400,000 deaths each year globally, air pollution has yet to be sufficiently addressed by the world's governments, researchers have warned. Air pollution damages the heart. According to an expert position paper published in the European Heart Journal, many types of cardiovascular disease are linked to poor air quality.
Not only does air pollution exacerbate existing heart problems, but it also appears to play a role in the development of heart disease in otherwise healthy people, the researchers said. There is particularly strong evidence of the harmful effects of suspended particles, as opposed to gas pollution, they said.
Reducing aircraft emissions globally will require effective regulations
January 4, 2015 08:17 AM - Valerie Brown, The Ecologist
Aviation emissions are a major clause of climate change, writes Valerie Brown - yet they remain unregulated. The gap between the best and worst performing airlines demonstrates ample opportunities for improvement - but is the political will there to impose effective regulation?
The performance gap suggests the industry could reduce GHG emissions significantly if the least efficient airlines would emulate the most efficient.
If commercial aviation were a country, it would rank seventh in global greenhouse gas emissions according to a recent report by the International Council on Clean Transportation(ICCT).
California's regulations on diesel trucks are having a positive impact on air pollution
January 3, 2015 08:42 AM - Lawrence Berkeley National Laboratory via ScienceDaily.
Ever wonder what's in the black cloud that emits from some semi trucks that you pass on the freeway? Lawrence Berkeley National Laboratory (Berkeley Lab) scientist Thomas Kirchstetter knows very precisely what's in there, having conducted detailed measurements of thousands of heavy-duty trucks over months at a time at two San Francisco Bay Area locations.
”‹With a specially outfitted research van equipped with sophisticated monitors for several pollutant types, he and his team are studying emissions levels from diesel trucks to understand and analyze the impact of new control technologies and California air pollution regulations.
Declining Monarch Butterfly Population Warrants Federal Protection
December 31, 2014 09:18 AM - Alicia Graef, Care2
As conservationists continue to worry about the possibility of a world without monarchs, they’ve gotten some hope with an announcement from the U.S. Fish and Wildlife Service (FWS) that federal protection may be warranted for these iconic butterflies. In August, the Center for Biological Diversity, Center for Food Safety, Xerces Society for Invertebrate Conservation and monarch scientist Dr. Lincoln Brower filed a legal petition with the FWS seeking protection for monarchs under the Endangered Species Act.
Plastic bag ban may be delayed in California
December 31, 2014 08:14 AM - Leon Kaye , Triple Pundit
California Senate Bill 270, passed by the state legislature and signed into law in September, would ban many retail stores from dispensing single-use plastic bags as of July 1, 2015. But in another example of a special interest perverting democracy when it does not get its way, the Plastics Industry Trade Association (SPI) has announced it has collected over 800,000 signatures to qualify for a statewide up-or-down vote in November 2016. Once that tally is confirmed, the July ban would be postponed until the following year.
You probably saw the sign gatherers at stores such as Target, where I was greeted with an appeal to sign my name and take sides with the “American Progressive Bag Alliance” in order to reverse this “backdoor deal” — until the fellow with the clipboard saw my reusable bags. “Oh, you’re one of those,” he said with an eye-roll, because as you know, someone like me who likes to wear labels, shops at Costco and makes mac-and-cheese out of a box (when no one is looking) is such a hippie.
Don't put old electronic items in the trash!
December 30, 2014 08:36 AM - NationSwell, Care2
Chances are, many Americans received shiny, new gadgets for the holidays — meaning their old electronics will either collect dust in a closet somewhere or get tossed out.
These unwanted laptops, tablets and printers contribute to the enormous amount of electronic waste, or “e-waste,” that continually piles up in our landfills. According to the EPA, 3.4 million tons of tech gear was trashed in 2012, and unfortunately, only 12.5 percent of e-waste is currently recycled.
Road salt not good for streams
December 29, 2014 08:10 AM - Cheryl Corley, NPR
This is the time of year when it's not uncommon to see big trucks barreling down highways and streets spreading road salt.
Steve Corsi, a hydrologist with the U.S. Geological Survey, says that translates into high levels of chloride concentrations for rivers like the Milwaukee in Wisconsin or 18 other streams near urban areas in Illinois, Ohio, Colorado and several other states.
"At many of the streams, concentrations have now exceeded those that are harmful to aquatic life," he says.
East Cost "nuisance" flooding already increasing
December 28, 2014 08:48 AM - ecoRI news staff
By 2050, much of U.S. coastal areas are likely to be threatened by 30 or more days of flooding annually because of dramatically accelerating impacts from sea-level rise, according to a new National Oceanic and Atmospheric Administration (NOAA) study.
The findings appear in a paper entitled “From the Extreme to the Mean: Acceleration and Tipping Points for Coastal Inundation due to Sea Level Rise” and follows an earlier study by the report’s co-author, William Sweet, Ph.D., a NOAAA oceanographer.