Dear EarthTalk: What’s the story with LED light bulbs that are reputed to be even more energy-efficient than compact fluorescents? — Toby Eskridge, Little Rock, AR

Perhaps the ultimate “alternative to the alternative,” the LED (light-emitting diode) light bulb may well dethrone the compact fluorescent (CFL) as king of the green lighting choices. But it has a way to go yet in terms of both affordability and brightness.

LEDs have been used widely for decades in other applications-forming the numbers on digital clocks, lighting up watches and cell phones and, when used in clusters, illuminating traffic lights and forming the images on large outdoor television screens. Until recently LED lighting has been impractical to use for most other everyday applications because it is built around costly semiconductor technology. But the price of semiconductor materials has dropped in recent years, opening the door for some exciting changes in energy-efficient, green friendly lighting options.

According to HowStuffWorks.com, LED bulbs are lit solely by the movement of electrons. Unlike incandescents, they have no filament that will burn out; and unlike CFLs, they contain no mercury or other toxic substances. Proponents say LEDs can last some 60 times longer than incandescents and 10 times longer than CFLs. And unlike incandescents, which generate a lot of waste heat, LEDs don’t get especially hot and use a much higher percentage of electricity for directly generating light.

But as with early CFLs, LED bulbs are not known for their brightness. According to a January 2008 article in Science Daily, “Because of their structure and material, much of the light in standard LEDs becomes trapped, reducing the brightness of the light and making them unsuitable as the main lighting source in the home.” LED makers get around this problem in some applications by clustering many small LED bulbs together in a single casing to concentrate the light emitted. But such LED “bulbs” still don’t generate light much brighter than a 35-watt incandescent, much too little light for reading or other focused tasks.

If LEDs are going to replace incandescents and CFLs, manufacturers will have to make them brighter. EarthLED is lighting the way with its EvoLux and ZetaLux bulbs, which use multiple LEDs in a single casing to generate light. The EvoLux delivers light equal to that of a 100-watt incandescent, the company says. But the $80/bulb price tag may be tough to swallow. The ZetaLux, which retails for $49.99, delivers light equivalent to a 50- or 60-watt incandescent, will last 50,000 hours and costs only $2/yearly to run.

Other bulb makers are working on similar designs for high-powered LED bulbs, hoping that an increase in availability will help spur demand, which will in turn lower prices across the board. Until then, consumers can find LED bulbs suitable for secondary and mood lighting purposes in many hardware and big box stores. C. Crane’s 1.3-watt LED bulb, for example, generates as much light as a 15-watt incandescent bulb. Check your local hardware store for other options, as well as online vendors such as Best Home LED Lighting, Bulbster, SuperBrightLEDs.com and We Love LEDs.

CONTACTS: How Stuff Works, www.howstuffworks.com/led.htm; EarthLED, www.earthled.com; Best Home LED Lighting, www.besthomeledlighting.com; Bulbster, www.bulbster.com; SuperBrightLEDs.com, www.superbrightleds.com; We Love LEDs, www.weloveleds.com.

Dear EarthTalk: Used motor oil is a big contributor to the pollution in our waterways and drinking water. How can I make sure I am not contributing to this problem? — John Eckerle, Jupiter, FL

Motor oil leaked from individual vehicles-or outright dumped by homeowners and commercial garages-constitutes a significant chunk of storm water runoff, the fallen precipitation that runs off of roads and parking lots and inevitably finds its way into local water bodies.

These pollutants include not only leaked motor oil-which may contain toxic substances like lead, benzene, zinc or magnesium-but also fertilizers, insecticides, plastic debris, cigarette butts, paints, solvents, sediments and other hazardous waste. Topsoil and natural vegetation would ordinarily filter many of these pollutants out, but the impermeable pavement that covers much of the surface where these pollutants originate carries it right into storm drains and into streams, rivers, lakes and the ocean where it can poison marine life-which we might eat-as well as entire riparian or coastal ecosystems.

This pollution also finds its way into underground aquifers that supply our drinking water, so reducing it is a human health measure and could also save municipalities millions of dollars a year in drinking water treatment facilities and operational expenses.

While government agencies try to craft and implement development and zoning standards to help reduce storm water runoff problems caused by commercial and industrial entities, there is still much that individuals can do to reduce their impact as well. Indeed, upwards of 40 percent of oil pollution in the U.S. comes from the improper disposal of used motor oil by individuals.

The U.S. Environmental Protection Agency (EPA) recommends keeping on top of automotive maintenance to prevent and repair leaks, and disposing of used motor oil and other automotive fluids and batteries at designated drop-offs or recycling locations (consult Earth911.org to find one near you). Also, it is preferable to wash your car at a commercial car wash instead of in your driveway. By law, car washes must treat their wastewater before disposing of it.

Besides handling and discarding your motor oil and other automotive fluids responsibly, cutting back on or eliminating fertilizers and pesticides from your lawn or garden will also reduce your negative impact. Also, don’t over-water your lawn, as that can create extra run-off as well. And if you are embarking on a residential landscaping project, try to incorporate permeable pavement (which allows run-off through it into the soils below) as well as rain barrels to collect water, and rain gardens, grassy swales and driveway-side vegetative strips-all planted with region-appropriate native plants of course-to help filter contaminants out before they hit the storm sewers.

Taking these small everyday steps may seem like a hassle, but the benefits for the environment and human health are immeasurable.

CONTACTS: U.S. Environmental Protection Agency, www.epa.gov; Earth911, www.earth911.org.

GOT AN ENVIRONMENTAL QUESTION? Send it to: EarthTalk, c/o E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881; submit it at: www.emagazine.com/earthtalk/thisweek/, or e-mail: earthtalk@emagazine.com. Read past columns at: www.emagazine.com/earthtalk/archives.php

Dear EarthTalk: What is “community based tourism” and how does it purport to safeguard pristine places? -- Erin O’Neill, Tukwila, WA 

Community based tourism refers to situations in which local people-usually those that are poor or economically marginalized in very rural parts of the world-open up their homes and communities to visitors seeking sustainably achieved cultural, educational or recreational travel experiences. 

Under a community-based tourism arrangement, unique benefits accrue to both the traveler and the hosts: Travelers usually accustomed to chain hotels and beachfront resorts discover local habitats and wildlife and learn about traditional cultures and the economic realities of life in developing countries. And the host communities are able to generate lucrative revenues that can replace income previously earned from destructive resource extraction operations or other unsustainable forms of economic support. 

Locals earn income as land managers, entrepreneurs or food and service providers-and at least part of the tourist income is set aside for projects which provide benefits to the community as a whole. And just as important, says ResponsibleTravel.com, which promotes community based tourism in a partnership with Conservation International, the communities become “aware of the commercial and social value placed on their natural and cultural heritage through tourism,” thus fostering a commitment to resource conservation. 

Travelers indulging in a community based tourism trip might follow a local guide deep into his tribe’s forest to spot otherworldly wildlife, eat exotic regional delicacies around rough-hewn tables, watch and even take part in celebrations of local culture, and sleep on straw mats at the homes of local families.  

In many cases, local communities partner with private companies and nonprofits that provide money, marketing, clients, tourist accommodations and expertise for opening up lands to visitors. In 1997, eco-travel operator Rainforest Expeditions wanted international visitors to learn about threats to the rainforest. Natives in Peru’s Es©-eja community of Infierno wanted to generate income without destroying their rainforest home, central to their subsistence lifestyle. So the two joined forces and the resulting Posada Amazonas lodge to this day offers visitors an exotic way to learn about rainforest ecology directly from English-speaking Es©-eja staff, who in-turn earn a living sharing their local knowledge and traditions. 

Another example is the partnerships that the nonprofit Projeto Bagagem (Project Baggage) has forged with several Brazilian communities to bring in tourist dollars to support sustainable choices. A third of the cost of every Projeto Bagagem trip goes to the villagers and another third to a local nonprofit. Last year the group won a Seed Award from the United Nations and the non-profit World Conservation Union for its efforts to translate “the ideals of sustainable development into action on the ground.”  

Extreme poverty coupled with abundant natural resources makes the Amazon basin an ideal place for such programs to thrive, but community based tourism can be experienced anywhere. To find qualifying, pre-vetted trips that contribute to local economies all over the world, visit ResponsibleTravel.com. 

CONTACTS: ResponsibleTravel.com, www.responsibletravel.com; Rainforest Expeditions, www.perunature.com; Projeto Bagagem, www.projetobagagem.org. 

Dear EarthTalk: How often do I really need to change my car’s oil? Conventional wisdom has always put it at every 3,000 miles to prevent engine wear, but isn’t changing oil that frequently wasteful and unnecessary? Also, what is the “greenest” and longest-lasting oil I should use? – Vic Roberts, Lincoln, MA 

There is much debate in the automotive world over how often drivers of typical passenger cars or light trucks should change their oil. The quick-lube chains usually recommend it be done every three months or 3,000 miles, but many mechanics would tell you that such frequent changes are overkill. Indeed, most car owner’s manuals recommend changing out the oil less frequently, usually after 5,000 or 7,500 miles. 

According to the automotive website Edmunds.com, the answer depends more on driving patterns than anything else. Those who rarely drive more than 10 miles at a time (which doesn’t get the oil hot enough to boil off moisture condensation) or who start their car frequently when the oil isn’t hot (when most engine wear occurs) should change their oil more often-at least twice a year, even if that’s every 1,000 miles, according to Edmunds. But commuters who drive more than 20 miles a day on mostly flat freeway can go as far as their owner’s manual recommends, if not longer, between changes. As a car ages, more frequent changes might be in order, but that’s for a qualified mechanic to decide on a case-by-case basis. 

“The necessity of 3,000 mile oil changes is a myth that has been handed down for decades,” writes Austin Davis, proprietor of the website TrustMyMechanic.com. He says that the economics of the oil change industry demand pushing customers to get their oil changed more frequently-purportedly as “cheap insurance” against problems cropping up-whether they need it or not. One of the largest oil change chains, Jiffy Lube, for instance, is owned by Pennzoil-Quaker State, and as such has an incentive to sell as much of the company’s traditional petroleum-based oil as possible. 

One way to reduce trips to and money spent unnecessarily on quick-lube outlets is to switch to synthetic oils, which last longer and perform better than their traditional petroleum-based counterparts. Davis says that educated drivers should opt for longer lasting, better performing synthetic oils, which are “most likely good for 10,000 to 15,000 miles or six months” whether or not their manufacturers recommend more frequent changes or not. Some synthetic motor oils, like Amsoil, NEO and Red Line, to name a few, are created specifically to last 25,000 miles or one year before needing a change. 

While neither conventional nor synthetic motor oils are good for the environment if disposed of improperly or spilled, most environmentalists would opt for the latter since it lasts three or more times longer and thus reduces waste (or energy use if recycled). Researchers have been experimenting with producing greener motor oils-one pilot project out of Purdue University has produced high-quality, carbon-neutral motor oil from canola crops-but consumers should not expect to see such products on store or garage shelves anytime soon, as the costs of production are high and the availability of cropland is limited. But the very existence of such alternatives-no doubt more are in the offing-bodes well for the future as oil becomes more scarce and expensive. 

CONTACTS: Edmunds.com, www.edmunds.com; TrustMyMechanic.com, www.trustmymechanic.com. 

GOT AN ENVIRONMENTAL QUESTION? Send it to: EarthTalk, c/o E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881; submit it at: www.emagazine.com/earthtalk/thisweek/, or e-mail: earthtalk@emagazine.com. Read past columns at: www.emagazine.com/earthtalk/archives.php.