Most of the nation's 34,000 dry cleaners still clean clothes using perchloroethylene, or “perc,” a hazardous air contaminant and a probable human carcinogen. But some cleaning professionals are moving to greener and safer methods, including the use of pressurized carbon dioxide, and "wet cleaning," which uses water, non-toxic detergents and conditioners inside specially designed machines. (Media credit/Simon Law)

The dry-cleaning industry has come under attack in recent years for its use of perchloroethylene (“perc”), a noxious chemical solvent that does a good job cleaning and not damaging sensitive fabrics but which is also considered a hazardous air contaminant by the U.S. Environmental Protection Agency (EPA) and a probable human carcinogen by the International Agency for Research on Cancer.

Also, exposure to perc can irritate the skin and has been associated with central nervous system disorders. Drycleaners are required to reuse what perc they can and dispose of the rest as hazardous waste, but there are still concerns about contamination at and around sites that don’t follow best practices. California has banned the use of perc by drycleaners beginning in 2023, and several other states may follow suit.

Given the issues with perc—and the fact that most of the nation’s 34,000 commercial drycleaners still use it—many consumers are demanding greener ways to get their fine clothes and fabrics clean. So-called wet cleaning—whereby cleaning professionals use small amounts of water, non-toxic detergents and conditioners (instead of perc and other harsh detergents) inside specially designed machines to get fine garments and other fabrics clean—is one of the most promising alternatives.

“The garments are agitated in the computerized wet cleaning machine just enough to extract the dirt and grime, but not enough to alter the structure, size or color,” reports the website Earth911.com. “The garments are then transferred to a high-tech drying unit that [that] automatically stops once the prescribed level of moisture is reached.” Earth911.com adds that after drying, wet cleaned garments are pressed, hung up and bagged for pick-up by or delivery to customers—just like at the drycleaners.

The EPA is encouraging drycleaners to make the switch to greener solvents through a cooperative partnership with the professional garment and textile care industry. The agency’s Design for the Environment Garment and Textile Care Partnership recognizes the wet cleaning process as “an environmentally preferable technology that is effective at cleaning garments.”

Another green alternative to perc is also starting to catch on: using pressurized carbon dioxide (CO2) to get fabrics clean. CO2 exists as a gas at low pressure but turns to liquid at higher pressure and can serve as a solvent in tandem with non-toxic soap to get materials clean. “Clothes are placed in the dry cleaning machine drum and cool CO2 is pumped in until, at high pressure, [it] becomes a liquid,” reports Corry’s, a leading drycleaner in the Seattle area. “After the wash cycle is complete the CO2 is filtered, and the pressure is released spontaneously converting the CO2 back to a gas from a liquid. The CO2 then goes back into the holding tank. The clothes are left clean, smelling fresh, cool and perfectly dry.”

There are other greener processes out there as well. If a new cleaner opens up in your neighborhood, chances are they are using something cleaner than perc. Or they should be. So make sure to go in and ask.

CONTACTS: Earth911.com, www.earth911.com; Design for the Environment Garment and Textile Care Partnership, epa.gov/dfe/pubs/projects/garment/; Corry’s CO2 Cleaners, www.corrysco2cleaners.com.

Dear EarthTalk: Is it true that palm oil, common in snack foods and health & beauty products, is destroying rainforests? If so, what can consumers do about it? – Emma Miniscalco, via e-mail

It’s no wonder that worldwide demand for palm oil has surged in recent years. Long used in cosmetics, palm oil is now all the rage in the snack food industry, since it is transfat-free and therefore seen as healthier than the shortening it replaces.

But to produce palm oil in large enough quantities to meet growing demand, farmers across Southeast Asia have been clearing huge swaths of biodiversity-rich tropical rainforest to make room for massive palm plantations. Today palm oil production is the largest cause of deforestation in Indonesia and other equatorial countries with dwindling expanses of tropical rainforest. Indonesia’s endangered orangutan population, which depends upon the rainforest, has dwindled by as much as 50 percent in recent years.

The clearing of these forests is a big factor in global warming, given how much carbon dioxide (CO2) trees store when left alone. Once forests are cut, tons of CO2 heads skyward where it does the most harm. Also, when not replaced by palm oil plantations, rainforests help maintain water resources by absorbing rainfall and then releasing it into streams and rivers, thus minimizing flooding and soil depletion.

Simply boycotting palm oil and the products containing it may not help, as reduced demand could force the companies behind the plantations to instead initiate more intensive timber harvesting and a widespread conversion of the land to agriculture, which would add a heavy pollution load onto the already compromised land, air and water. It is up to the countries involved in palm oil production to regulate the industry and budget sufficient funds for enforcement. But with huge profits coming in from the sale of palm oil, public officials in Indonesia and elsewhere are loathe to clamp down on their golden goose.

Several of the largest palm oil producers have joined forces with banks and nonprofit groups to try to green up the industry. In 2003, some 200 commercial entities in the global palm oil supply chain met and established the Roundtable on Sustainable Palm Oil (RSPO) to promote the growth of palm oil in an environmentally friendly manner. RSPO works to develop definitions and criteria for the sustainable production of palm oil, while facilitating the adoption of more green-friendly practices throughout the industry. The group celebrated its first shipment of “sustainable palm oil” to Europe this past November.

Despite progress, many green leaders are skeptical that RSPO has the teeth to make a positive impact on the fast-growing palm oil industry. Greenpeace International considers RSPO to be “little more than greenwash,” pointing out that at least one RSPO-certified producer-United Plantations, a supplier to Nestlƒ© and Unilever-is deforesting Indonesia’s vulnerable peat land forests. And Sinar Mas, another major RSPO player, has cleared tropical rainforest all over the country for its palm oil plantations, and is still expanding rapidly. Greenpeace is calling for a moratorium on deforestation throughout Indonesia so that the RSPO and the government can take stock and then proceed accordingly.

CONTACTS: RSPO, www.rspo.org; Greenpeace, www.greenpeace.org.