NORTHBROOK, Ill. and OTTAWA, Canada — Greenwashing still plagues the marketplace, with the vast majority of products that claim to be green -- more than 95 percent -- are actually stretching the truth in some way.

Yet despite the dismal statistics, there are also signs of optimism: Marketers are getting better at making truthful green claims and the number of products being accurately marketed as green is rising, according to the latest research from TerraChoice Environmental Marketing, the firm behind "The Sins of Greenwashing: Home and Family Edition."

"For three years in a row, we've found that greenwashing is a problem and a persistent problem, in that there is a lot of it around," said Scott McDougall, TerraChoice president and co-author of the report. "This year we have some good news to report: Consumers are clearly and literally changing the world for the better. They're demanding green products, and again this year we've seen the number of green products on offer go up dramatically."

The firm found a 73 percent increase in the number of green products on the market this year compared to 2009. Of the 5,296 products evaluated by the firm, 4.5 percent were found to be "sin-free," meaning the products passed muster on a seven common greenwashing missteps, including the sins of the hidden trade-off, no proof, vagueness, irrelevance, lesser of two evils, fibbing, and worshipping false labels.

This compares to 2 percent of sin-free products in 2009, and just 1 percent in 2007, according to TerraChoice, which is a sister company to UL Environment and also administers Canada's EcoLogo certification program.

In certain product categories that have had green items for longer periods of time, such as office or construction and building buildings, the proportion of sin-free products was five times greater than more "immature" product categories, such as toys and baby products.

BPA and Greenwashing

This year, the number of Bisphenol A (BPA) and phthalate claims sky-rocketed compared to last year, particularly for toys and baby products, where two-thirds of these claims appeared. BPA-related claims increased 577 percent, while products with phthalate-free claims grew a whopping 2,550 percent.

The two chemicals have made headlines in recent years. Canada has declared BPA, which mimics estrogen, to be a toxic substance over concerns of exposure for fetuses, infants and children. Phthalates can disrupt the endocrine system and cause birth defects.

"The attention is a good thing, the demand is a good thing, the corporate response is a good thing," McDougall said. "The problem with those claims is we couldn't find a single one that gave any evidence of the reliability of that claim."

For proof, companies could get certified through an existing standard in which BPA or phthalates are chemicals of concern. They could also seek third-party certification that confirms the absence of these chemicals, or even publish internal scientific documentation.