Friday, December 9, 2005

Wildlife in the city

During the past decade new types of wild creatures have appeared in parks, woodlands and backyards of the city. In addition to the usual skunks, raccoons, squirrels, rabbits, chipmunks, and Canada geese, there are now coyotes, foxes, bobcats, fisher, weasels, river otter, wild turkeys, and an increasingly large white-tailed deer population. Moose have not yet appeared in Newton, but they have had front-page notice in towns nearby, and black bears have reentered the forests of western Massachusetts. Will they be our next big visitors?

Reasons for this change were presented by Colleen Olfenbuttel, staff member of the Massachusetts Division of Fisheries and Wildlife www.masswildlife.org, in her Nov. 15 lecture at the Newton Free Library sponsored by the Newton Conservators. She noted that all of these animals were living in the forests of New England when European settlers arrived in the 17th century. They disappeared after the trees were cut for timber and the land cleared for farming. By 1840, much of the soil was exhausted, farming became more difficult, and people moved to richer lands of the Midwest or sought their fortunes in large cities with the coming of the industrial revolution.

Since that time, our forests have returned, and now an estimated 70% of Massachusetts is covered with second growth. This has led to restoration of wild animal populations, with the exception of wolves and mountain lions, entirely extirpated from the Northeast through bounty hunting. As housing has exploded into rural areas, with developments rising in forested landscapes, human encounters with wildlife have increased. Suburban gardens, shrubs, fruit trees, and bird feeders provide tempting food for many wild creatures, and garbage added to mulch piles or left outside in trash bags spells "dinner" for raccoons, skunks and coyotes. Crawl spaces under porches and garages attract these same animals, also foxes, as dens for rearing young. With hunting prohibited, large predators absent, food supplies handy, and living space provided, why should they forego such comforts?

Living with wildlife in our surroundings is a source of pleasure for most Newton residents, but we find some challenges in our attempt to maintain a healthy and happy coexistence with these new species as they return to their rightful domain. In order that they may be protected and continue normal patterns of behavior in the wild, it is important that they not become dependent on humans for food and living space. To underscore this point, Olfenbuttel introduced a discussion of the coyote, displaying a beautiful mounted specimen of the animal. Many who had never seen one in the wild expressed surprise at its relatively small size - its average weight is only 40 pounds.

She described the territorial behavior of the coyote. Its howling and yipping at night are a means of keeping in touch with other members of its group - and a warning to outsiders to stay away! Coyotes are shy and wary by nature, avoiding contact with people. Their diet is varied, and they can be tempted into neighborhoods where food is available. True omnivores, they prey on small mammals such as squirrels and chipmunks, but they also like fruits, berries, and birdseed. They will eat road kill or any pet food or garbage left outdoors. They have been known to run down unprotected small house pets. Owners of cats and little dogs are advised to keep them indoors. (Because house cats, across the nation, kill millions of birds each year, there is further reason to keep them inside!)

To maintain coyotes in their normal wild state, Mass Wildlife suggests the following:

1.     Don’t feed or try to pet them!

2.    Put garbage outdoors in strong containers, not plastic bags

3.    Feed pets indoors so unfinished food is not left outside.

4.    Don’t let cats or small dogs roam freely outside

5.    Keep areas under bird feeders clean

6.    Close off crawl spaces under porches.

If coyotes become persistent in hanging around, help them to remain wary of humans by scaring them off with loud noises, a bright light, or even water sprayed from a hose if necessary.

Wild turkeys and the Canada Goose are also year-round Newton residents, but these animals will be discussed in another article.

The goal of conservation is to preserve appropriate habitat for those species rejuvenated by the return of our forests, allowing them to live in nature as they were originally born to it. The effort of Mass Wildlife is to reacquaint the public with the particular needs and behaviors of these animals, so they can remain as wild creatures while sharing much of their territory with the human population.

 Modestino Criscitiello is Professor of Medicine, Emeritus, Tufts University School of Medicine. He is a Board member of the Newton Conservator and host of the Conservators’

Environmental Show on NewTV.

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These teens relish Envi-Sci

In our busy suburban world kids don’t get to experience nature much unless it’s planned into their schedules. That’s why Newton’s Environmental Science Program for teens is special. You can see this program in action during December on NewTV, Newton’s community cable television channel.

This episode of The Environmental Show travels along with teens as they go hiking, biking, canoeing and climbing, and visit woods and ponds, the Charles River, parks, a salt marsh, and mountains, winding up with a stay at the highest peak in the northeast (Mt. Washington). They also participate in a hands-on environmental cleanup project each year. As several of the teens point out, they make friends and have fun while they’re out there.

The summer program was started by Newton teachers 38 years ago with a Ford Foundation grant designed to get kids out into the environment instead of learning about it only through books and labs. The program now operates under the Newton Conservation Commission. Many of the students eventually become leaders in the program, trained to teach their younger peers what they have learned about plants and animals, geology, and ecology.

In fact, many of the participants go on to careers in science. All carry with them a lifetime appreciation for our natural environment.

 To learn more about enrolling in this July program for teens, visit http://www.newtonenvisci.org or call David Backer, Exec. Director, at 617-969-0288.

 To watch this show, tune in to NewTV’s Blue Channel (Channel 10 for Comcast subscribers and Channel 15 for RCN subscribers). The show will run repeatedly through December on Saturdays (10 a.m.), Mondays (3 p.m.), Tuesdays (1:30 p.m. and 11:30 p.m.), Wednesdays (11:30 a.m.) and Thursdays noon, 4 p.m. and 7:30 p.m.

 This episode of the Environmental Show is produced by the Newton Conservators. Learn more about the organization’s programs and view beautiful photographs at www.newtonconservators.org.

Patricia Goldman is a former Executive Director of the Asthma & Allergy Foundation of America/New England Chapter, a former member of the Newton Human Rights Commission, and is currently a board member of NewTV helping to produce The Environmental Show.

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Insulation: A wise investment

By Paul Eldenkramp/ Special To The Tab

The Kyoto Committee of the Green Decade Coalition/Newton has been investigating insulation quality in Newton houses and has been finding lots of missed opportunities.

A well-insulated house is comfortable and treads more lightly on the environment - and it is a good investment. Let’s say you spend $4,000 on an insulation upgrade and anticipate saving $500 in fuel costs per year. If you expect to live in your house for 15 more years, and assuming a 5 percent annual rate of increase in fuel costs, the rate of return on your weatherization investment will be 13.7 percent. That’s an excellent investment from a financial perspective, aside from the benefits of increased comfort and decreased carbon emissions. (For a simple on-line tool to calculate investment return for energy improvements, see www.energytools.com/calc/EnerEcon.html).

We found three basic types of insulation problems - let’s call them investment opportunities - in our initial studies of older Newton homes: no insulation, old insulation in need of an upgrade, and new insulation done badly.

Many older Newton homes have no insulation at all. Some homeowners believe that adding insulation puts an older house at risk of moisture problems, but if you have no moisture problems now, adding insulation willnot create them. If you have existing moisture issues - roof or window leaks, relative indoor humidity above 60 percent in the winter, or standing water in the basement after a rain - then adding insulation may complicate the problem, so address those issues prior to insulating.

Some homeowners are not aware that they have no insulation. If you are one of them, check the attic first. If you have no insulation there, you probably have none in the walls, because the attic is the easiest place to insulate. To check if the walls have insulation, drill a 1-inch hole in an out-of-the-way place (like the back of a closet) through the plaster and lathe (no deeper) and shine a flashlight in. If you’re looking into an empty cavity, you probably have no wall insulation.

In one of our "Kyoto case studies" we looked at a house that had no insulation, but which had new cooling and heating equipment that was roughly twice the capacity that would have been required had the house been insulated. That extra heating and cooling capacity cost several thousand dollars - money that would have been invested more wisely in insulation, which would have significantly reduced operating costs.

Many homeowners insulated their houses during the spikes in energy costs in the mid-1970s or early 1980s. Since then, we have learned more effective insulation methods and new products and technologies have been developed. An area of your house that may not have been cost-effective to insulate in 1980 may offer good payback now.

Air-sealing is as essential to insulating a house as insulation itself. There are two good methods for achieving this. Dense pack cellulose involves blowing cellulose insulation into walls to a density of about 3.5 pounds per foot, a density at which the material is packed solidly enough to inhibit air leakage but not so solid as to promote heat loss through conduction. To achieve the proper density, the installer’s equipment needs to be well tuned and he or she needs to know where to drill holes for maximum coverage and precisely how to insert the hose into the holes. Don’t take these prerequisites for granted - ask questions.

Spray-foam insulations, such as two-part polyurethane foams and Icynene, have established track records for safety and performance. They’re best used in open bays - as in walls prior to the application of the drywall and in attic rafters. Some contractors will spray foam into closed cavities such as finished walls but in that application cellulose is usually safer, cheaper, and equally effective.

Accomplishing a good insulation job in an old home can be difficult and counter-intuitive. Insulation crews tend to target easy spaces that maximize the amount of material they can install in the least amount of time. Sometimes this works, but sometimes it misses the mark.

One home we audited had had major insulation work done under a utility-company rebate program in 2001 at a cost of several thousand dollars, but the house was one of the worst performers we documented. The job had been done with a poorly tuned blower that did not generate sufficient nozzle pressure to force enough cellulose into the walls, resulting in settling of material and insulation voids. No attention had been paid to air-sealing, so there were major cold spotson interior walls because of cold air leakage into the basement, up interior chases and out through attic eaves.

To prevent such missed opportunities, the Kyoto Committee has concluded that it’s worth spending $250-350 for an energy audit that includes a blower door test and an infrared scan of your house. Audits can be arranged through Keyspan if you have gas heat and NSTAR if you have oil or electric heat. If your house has little or no insulation, do the audit as you are nearing completion of the insulation job. Prior to then, the audit will mainly document that you have a leaky house - something you knew already. After most of the work has been done, however, the audit will tell you exactly where to focus the final efforts - the infrared camera will reveal specific insulation voids in walls, and the blower door test will pinpoint areas of leakage that should be sealed, usually with spray foam insulation. If the house has been insulated with cellulose, you can use a few cans of lumberyard spray foam to provide enough air-sealing to make a big difference. However, given some of the tricky roof configurations of these older homes, you may need to hire a spray foam crew to finish the job.

In conclusion, we can say with confidence, based on our audits, that for older homes where insulation work was done in the 1970s, it’s time for an upgrade from an energy savings perspective. We have equal confidence that homeowners will reap financial benefits from these improvements.

Paul Eldrenkamp is a Newton-based remodeling contractor and chair of the Green Decade Coalition’s Kyoto Committee.

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Wednesday, December 7, 2005

Bats and EIDs

By Tigga Kingston/ Special To The Tab

 

Gently, I reach into the holding bag and pull out the first of the night’

s catch. 65 million years of evolutionary perfection - a beautiful trefoil horseshoe bat (Rhinolophus trifoliatus). Her grayish-fawn fur is long and fluffy and she has yellow ears, elbows and knees and tan-colored wings.

With over 1,100 species, bats account for 20 percent of mammals and are found on all continents except Antarctica. In the wet tropics bats comprise more than half the mammal species, and in South America over 100 species can coexist at a single locality. This species richness is matched by unparalleled ecological diversity- bats eat fruits, nectar, leaves, insects, small terrestrial vertebrates, and fish. Despite popular myths, there are only three species of vampire bats, restricted to Central and South America.

 

Tragically, nearly a quarter of all bat species are threatened by extinction, mainly due to habitat loss, hunting, disturbance at roost sites and pesticides. Conservation has been greatly impeded by a lack of understanding of these animals. Demonized and feared across cultures for centuries, shrouded in myth and prejudice, bats now face another challenge to their unfairly tarnished image - their role as natural wildlife reservoirs in the emergence of new and sometimes fatal infectious diseases.

In 2005, scientists identified three horseshoe bat species (genus Rhinolophus) from China as the probable natural wildlife reservoir for the SARS (severe acute respiratory syndrome) virus. SARS first emerged in China in 2002, infected about 8,000 people around the world in 2003 and killed more than 750 people; the cost to the global economy was more than $50 billion. SARS is one of several infectious diseases that emerged in the last decade in which bats have been identified as the probable wildlife reservoir. In the late 1990s, Nipah virus spilled over from pigs to humans in Malaysia, resulting in the death of 108 people. Old World fruit bats in the genus Pteropus (flying foxes) appear to be the original hosts of Nipah virus, the related Hendra virus, and probably Ebola virus.

From a conservation perspective, this would seem to be the final nail in the coffin of bat public relations. The health and economic impacts of Emerging Infectious Diseases are a global concern, and it is critical that outbreaks are controlled and minimized, but we must protect bats while addressing these diseases.

Large-scale culling programs - often the first response of beleaguered governments- are the last thing biologists and conservationists wish to see. Bats are a major and unique component of global biodiversity, and provide critical ecosystem and economic services as pollinators, seed dispersers and predators of insects. For example, in the Old World, more than 500 economically important products are derived from these plants pollinated or dispersed by bats - including favorites such as durian, petai, mango, banana, guava, figs, carob, cashew, avocado, dates, jackfruit and papaya. The durian trade alone is worth in excess US$1.5 billion annually.

Insectivorous bats consume a least half their body weight in insects every night. In a six month period, a single colony of Mexican free-tailed bats may consume over 2,450 metric tons of insects, which include the most damaging agricultural and forestry pests.

Ethical and conservation issues aside, eradication of host species is ineffective in managing disease. Seventy years of aggressive campaigns to eradicate vampire bats (sometimes deploying draconian methods such as poison gas or blasting) did little to control bovine rabies in South America but resulted in the destruction of millions of bats of many species. Eventually, ecological and behavioral research led to selective control methods that are now proving effective. Policy must be based on solid research.

In the wild, host bat species show little signs of infection by the viruses they harbor. These viruses have been present in bat populations for 1000s -maybe millions - of years, but have only emerged recently. Understanding why bat-borne viruses are emerging now is the key to predicting and minimizing future outbreaks.

Although bats can pass some diseases directly to humans, such as rabies, in many cases (including, Hendra, Nipah and SARS) there is no direct transmission of the virus from bats to people. The viruses usually infect an intermediate "amplifier" host that is in contact with both bats and humans. In SARS this host was the masked palm civet. These are naive hosts with little or no resistance to the pathogens, resulting in rapid replication of the virus. This promotes transmission to other individuals of the same species, and can lead to genetic modifications that enable the virus to jump to humans. In most cases transmission to humans has occurred only among people closely associated with an amplifier host. In China wildlife traders and restaurant owners were the first to become infected with SARS, which reached epidemic proportions because of human-human transmission.

Historically bats had very little contact with spillover hosts, certainly not enough to sustain an infectious virus. Civets are generally solitary; it was the unnatural aggregations in crowded wildlife markets supplying the wildlife meat trade in South China that enabled them to become potential hosts. Neither pigs nor horses are native to Australia and farm pigs in Malaysia are far removed from their wild boar relatives, so all these represent naive hosts. Intensive farming practices then promote the rapid spread of pathogens within local populations.

Introducing domestic livestock into remote areas, coupled with intensive animal husbandry practices, have created opportunities for these diseases to emerge. In the live markets of China, bats and bat products are widely sold for food and traditional medicine, bringing them into direct contact with other wildlife traded for meat such as civets. The outbreak of Nipah virus in Malaysia was similarly precipitated by human actions. Fruit bats throughout South East Asia and Australia have declined dramatically due to hunting and habitat loss; these stressors have led to changes in foraging behavior that can directly impact viral dynamics while bringing bats into close proximity with people and livestock. Pig consumption of fruit pulp spat out by the bats seems to be the route by which infected saliva and urine passed from bats to pigs in Malaysia, and the mode of transmission from bats to horses is probably similar. Infectious diseases have emerged due to human actions that affect the availability of amplifier hosts and the ecology of reservoir hosts. These diseases will not be controlled by controlling bats, but the risks could be minimized if links between reservoir species and spillover hosts are broken. In the short term, trade in wild animals for medicine and food increases the risks, and it is clear that domestic livestock should not be housed near fruit bat feeding trees. In the long-term, research on the interaction between host ecology, species-species transmission and human modification of the environment are the most likely means by which the emergence of new infectious diseases will be controlled.

Tigga Kingston, PhD, Sr Res Assoc, Geography & Environment Dept, BU, Director of the Malaysian Bat Conservation Research Unit, studies bat diversity in the threatened rainforests of SE Asia. Her work focuses on understanding the ecology, conservation biology and evolution of these vital mammals.

 

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Towns work to identify, eliminate bacteria in river

By David Kaplan/ Special To The Tab

The Charles River’s Lower Basin is one of the most heavily trafficked recreation waters in Massachusetts, supporting thousands of boaters daily in peak summer months. Despite marked improvement in the river’s water quality from 1995, bacteria levels sometimes exceed Massachusetts’ standards for safe swimming and boating.

Illicit connections of sanitary sewer pipes to stormwater pipes are a significant source of bacterial pollution and can discharge untreated sanitary waste into the Charles River even in dry weather. "Federal policy requires towns to initiate stronger and more vigilant illicit connection detection and elimination programs," said Anna Eleria, environmental engineer at Charles River Watershed Association. "Watershed towns have responded with action plans to step up their efforts to reduce bacterial pollution in their water bodies."

Eleria cited work in Newton and Brookline involving water sampling and dye testing within the stormwater infrastructure to pinpoint potential sources of wastewater and remove the connections to the stormwater system.

According to Newton’s quarterly report to the US EPA, the overseeing body, on their progress in detecting and eliminating illicit connections, the city is in the process of mapping and sampling stormwater catch basins and outfall locations to determine areas of concern for future analysis and action. In their report, Brookline officials estimate that nine illicit connections and nearly 3,500 gallons per day of wastewater flows have already been removed from the stormwater drainage system.

The Charles River also receives bacteria and other pollution from raw sewage released from combined sewer outfalls during heavy rain events. Combined sewers are antiquated systems originally designed to collect and convey a combination of both stormwater and sanitary wastewater directly into a lowland waterbody.

The Massachusetts Water Resources Authority collects combined wastewater in interceptor pipes and pumps it to the Deer Island Wastewater Treatment Plant in Winthrop. To prevent sewers from backing up into homes, combined sewer overflows are activated when inflow exceeds the treatment plant’s capacity, dumping millions of gallons of treated and untreated sewage into the river each year.  

Boston and Cambridge still have combined systems and are working towards their eventual separation, which will reduce inflow to the treatment plant and decrease the frequency of CSO discharges. Cambridge recently separated sewerage in the Cambridgeport area and has more projects on the horizon. Separating systems is both time-consuming and costly, but must be done to secure the future health of the Charles River and its boaters.

Acknowledging the public’s need for better, "real-time" water quality information, CRWA, with financial aid from federal, state and local government programs created and implemented a water quality monitoring and public notification project in 1998. The program completed its eighth successful season in October 2005 with its assessment of bacteria levels for the Head of the Charles Regatta.

"Samples taken from the Charles are analyzed for fecal coliform bacteria, which signals the presences of human and animal waste and is also an indicator of other, more harmful bacteria," said Ariel Dekovic, who manages daily notification of the flag colors. "The models predict daily fecal coliform bacteria concentrations, and the probability that these concentrations exceed the Massachusetts state water quality standard for safe boating conditions."

The program relies on a combination of water quality sampling and the use of statistical models developed by CRWA in 2002 in collaboration with U.S. Geological Survey and Tufts University.

David Kaplan, MA (Environmental Mgmt, Duke University), was a CRWA intern in 2000 and is now one of their Watershed Scientists. He is proficient in GIS, and has worked extensively on water quality projects.

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Opinion: Chicken Little was right

By Lois Levin/ Special To The Tab

Your childhood fears were not irrational.  It’s a dangerous world.  Marvelous medical and technological innovations bring us many comforts, information at lightning speed, and can rescue us from the jaws of death, but we are nonetheless becoming more vulnerable to environmental collapse and to pandemics.

These two looming threats are interrelated.  The planet can support billions of people, but some of them, and enormous quantities of goods and natural resources, travel rapidly around the globe every day.  Toxic substances are dispersed unrelentingly into the air, water, soil; the planet warms, disrupting all of Earth’s ecosystems.

There have been many pandemics in human history.  Viruses mutate and cross into human populations from contact with wild animals, moving as rapidly as people and goods around the planet, as hitchhikers.  They include:  Avian Flu, West Nile Virus, SARS, Ebola and HIV/AIDS.  We have no natural immunity to these viruses, which spread wherever people congregate.

Avian flu, in particular, threatens the entire planet as fast as our efficient transportation systems are moving passengers.  We have the knowledge today to develop vaccines and to implement immunization programs against these diseases, but not rapidly enough to prevent large numbers of deaths and great human suffering.  Viruses spread like wildfire after escaping from a wild population and mutating.

We cannot keep apace of Emerging Infectious Disease (EIDs).  It took nearly two years for SARS viruses to get to the first human trials, and it will take another two years before safe general distribution is possible. And immunizing all at-risk individuals is impossible.

The underlying problems are: (1) Deforestation – humans are unrelentingly invading and destroying wildlife habitat, and  (2) inadequate control of wildlife commerce.  Even a crash program to produce enough vaccine for everyone within our borders would not solve those dilemmas.  And we cannot, like Osama bin Laden, all move to caves in remote mountains.

EID is a global issue.  The major burden of its costs to the environment and to human health are borne by the public. Most national governments have limited resources, but the rich nations and big corporations can afford to underwrite immunization programs in countries where cases of bird flu are now occurring.  Such programs, albeit reactive measures, could immunize all the farmers who handle poultry as well as their families, and could closely monitor the local people who are at greatest risk.  This is an approach that requires a shift in thinking beyond the current focus on domestic interventions.  But immunization programs are not enough.

We have much work to do to convince our own government and multinational corporations to take proactive actions to address this looming crisis.  That means looking at the big picture.  It means implementing tried and true conservation measures to stop deforestation and to control illegal wildlife trade – the reasons that these diseases are emerging in the first place.

Lois Levin, PhD, a Green Decade Coalition board member, coordinates the Environment Page of the Newton TAB.

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Toxic confusion: a thousand points of … dirt?

By Jill Hahn / Special To The Tab

Do you think you ought to be able to find out what toxic chemicals are being released in your community?

So did the U.S. government after the 1984 Bhopal disaster, when chemicals released from a Union Carbide plant in India killed thousands of people. That’s when the Toxics Release Inventory program was created. The TRI program requires companies and federal facilities of a certain size to provide annual reports of their releases of toxic chemicals to the Environmental Protection Agency, which then makes the information available to the public.

For example, let’s look at our own county, Middlesex County. The TRI informs us that from 1988 to 2002 (the period for which reports are available), Middlesex County scored in the top 20 percent of dirtiest counties in the U.S. for pounds released into the air of recognized carcinogens, developmental toxicants, and reproductive toxicants on the TRI list (Scorecard: the Pollution Information site, http://www.scorecard.org/env-releases). Useful information.

However, the EPA now seems to be backing away from its almost twenty-year commitment to keeping the public well-informed about toxic chemicals. It has recently proposed three changes to TRI reporting (http://www.epa.gov/tri/)):

1. Move from annual reporting to every-other-year reporting. But many facilities show huge shifts in emissions from year to year, so every-other-year reporting could be misleading.

2. Allow facilities to release 10 times as much pollution before being required to report. This provision would raise the maximum Annual Reportable Amount from 500 to 5,000 pounds.

3. Permit facilities to withhold details on low-level production of persistent, bioaccumulative, and toxic chemicals like mercury, lead, and dioxin. But PBT chemicals, which the EPA has identified as "chemicals of special concern," can travel long distances, remain dangerous for long periods of time, and are particularly harmful to children and developing fetuses.

Why do these changes matter? Federal and state policy makers need access to adequate information in order to make decisions that protect our health, safety, and environment. Every regulatory program at the EPA relies on the TRI for data on specific toxic chemicals released to the environment. These data need to be as accurate (able to track the year-to-year variability) and comprehensive (requiring reporting on chemicals of special concern) as possible.

The EPA, in announcing its proposed changes, only cites as its rationale for the changes the burden reporting places on industry (http://www.epa.gov/tri/). It does not offer any health justification, or show any evidence that less than 5000 pounds of toxic output annually is not harmful to the environment. Is the lightening of this reporting burden, which the EPA itself says has been made significantly less costly through improvements in reporting software, a trade-off that benefits the public?

The comment period for the TRI Burden Reduction Proposed Rule extends until January 13, 2006. If you are interested in learning more, a good place to start is the web site of the Union of Concerned Scientists, (http://ucsaction.org/campaign/11_30_05_toxic_release_inventory/explanation), or the EPA’s web site, (http://www.epa.gov/tri/).

Jill Hahn, a Newton Highlands resident, is a biologist, a writer, and a mom. All three roles contribute to her passion about environmental issues. She can be reached at jkkhahn@comcast.net.

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