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Eco-Beat

According to the Worldwatch Institute, Americans only recycle 0.6 percent of the 100 billion plastic bags they take home from stores every year.

EarthTalk®

The Editors of E The Environmental Magazine

Dear EarthTalk: I’ve heard conflicting reports regarding how long it really takes for a plastic grocery bag to decompose. Can you set the record straight? —Martha Blount, San Diego, CA

Researchers fear that such ubiquitous bags may never fully decompose; instead, they gradually just turn into smaller and smaller pieces of plastic. The most common type of plastic shopping bag is made of polyethylene, a petroleum-derived polymer that microorganisms don’t recognize as food and, as such, cannot technically “biodegrade.” The U.S. Environmental Protection Agency (EPA) defines biodegradation as “a process by which microbial organisms transform or alter (through metabolic or enzymatic action) the structure of chemicals introduced into the environment.” In “respirometry” tests, whereby experimenters put solid waste in a container with microbe-rich compost and then add air to promote biodegradation, newspapers and banana peels decompose in days or weeks, while plastic shopping bags are not affected.

Even though polyethylene can’t biodegrade, it does break down when subject to ultraviolet radiation from the sun, a process known as photodegradation. When exposed to sunshine, polyethylene’s polymer chains become brittle and crack, eventually turning what was a plastic bag into microscopic synthetic granules. Scientists aren’t sure whether these granules ever decompose fully and fear that their buildup in marine and terrestrial environments—and in the stomachs of wildlife—portend a bleak future compromised by plastic particles infiltrating every step in the food chain. A plastic bag might be gone in anywhere from 10 to 100 years (estimates vary) if exposed to the sun, but its environmental legacy may last forever.

The best solution to plastic bag waste is to stop using disposable plastic bags altogether. You could invest a few bucks in reusable canvas totes—most supermarket chains now offer them—or bring your own reusable bags or backpacks with you to the store. If you have to choose between paper and plastic, opt for paper. Paper bags can biodegrade in a matter of weeks and can also go into compost or yard waste piles or the recycling bin. Of course, plastic bags can be recycled also, but as just explained, the process is inefficient. According to the nonprofit Worldwatch Institute, Americans only recycle 0.6 percent of the 100 billion plastic bags they take home from stores every year; the rest end up in landfills or as litter.

Another option, which some stores are embracing—especially in places like San Francisco where traditional plastic shopping bags are now banned in chain supermarkets and pharmacies, is so called compostable plastic bags, which are derived from agricultural waste and formed into a fully biodegradable faux-plastic with a consistency similar to the polyethylene bags we are so used to. BioBag is the leader in this field, but other companies are making inroads into this promising, new green-friendly market.

San Francisco’s pioneering effort to get rid of polyethylene bags is a positive step, but environmentalists are pushing for such bans more widely. A California effort to ban plastic bags failed again recently, but will likely eventually succeed. Washington, Florida, New Jersey, and North Carolina are watching closely and considering similar laws, depending on what happens in the Golden State. Worldwatch reports that taxes on plastic bags in South Africa and Ireland have been effective at reducing their use by upwards of 90 percent; Australia, Canada, New Zealand, the Philippines, Taiwan, and the U.K. are also planning to ban or tax plastic bags to help stem the tide of plastic waste.


Don’t fall victim to wildfire

Wildfires pose a real threat to residents across the country, and there are steps you can take to reduce your risk of loss and to protect those you love.

Wildfires are a natural part of the environment. They occur in areas where patterns of dry and windy weather exist. According to the National Interagency Fire Center, over 77,000 fires burned nearly 6 million acres across the entire U.S. in 2009.

To help educate the public, the National Fire Protection Association’s Firewise program helps communities lower the risk of damage before wildfire starts.

“By learning about how wildfires spread and taking simple steps to reduce damage, we can adapt to the inevitability of wildfire danger,” said Michele Steinberg, Firewise program manager in Quincy, Massachusetts. “Wildfires do not have to burn everything in their paths. You can prepare your home simply and effectively.”

Make Your Home Firewise

To reduce the wildfire threat around your home, start close and work your way out.

  • Remove leaves and debris from gutters, eaves, porches, and decks to prevent an ember from igniting your home.
  • Water and maintain your lawn regularly. Consider xeriscaping if you live in an area with water restrictions.
  • Maintain a “fuel-free” area within 3-5 feet of your home. Nothing that can catch fire should touch the sides of your house, deck, or porch.
  • Reduce vegetation surrounding a home (30 to 100 feet away, depending on the area’s risk of wildfire).
  • Prune large trees so that the lowest branches are six to 10 feet high. This will help prevent a wildfire from spreading up to the treetops.
  • Dispose of cuttings and debris promptly.
  • When planting, choose slow growing, carefully placed shrubs and trees so the area can be more easily maintained.
  • Landscape with less flammable plants. Contact your state forestry agency or county extension office for plant information.
  • The most protective roofing materials will be rated “Class-A,” including asphalt shingles and metal, cement, and concrete products. 
  • Roof construction, including the sub-roof, should also be fire-resistant.
  • Wall materials most resistant to heat and flames include brick, cement, plaster, stucco, and concrete masonry.
  • Use fire-resistant materials such as stucco or masonry for exterior walls. These products are better than vinyl, which can soften and melt.
  • Double-paned or tempered glass windows also make a home more resistant to heat and flames.

To learn more about how you can take action to reduce wildfire damage to your home, download a free Firewise user guide at www.firewise.org. You can also get detailed landscape techniques, homeowner checklists, and information on building construction choices.

     

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