A peer set of small (4%) but powerful group of consumers,� or "Greenfluencers," are driving trends and shaping purchasing decisions in the mass market, according to a study of nearly 12,000 U.S. adults conducted by Porter Novelli.

Unlike their counterparts in earlier environmental movements, Greenfluencers are not third-party experts or full-time advocates with a laser-like focus on advancing a specific agenda. Rather, this new highly influential group, which amounts to roughly four percent of the U.S. population, is young, racially diverse and outspoken on a variety of social and political issues.

Based on seven different types of behaviors and product/service usage patterns, such as buying energy efficient appliances and punishing companies with poor environmental records by not buying their products, Porter Novelli developed a “Green Gauge” to categorize respondents into four levels of “greenness.”