To set standards, help police the green marketplace, and inform consumers, numerous eco-labeling guides have emerged in recent years. Applying quantitative and/or qualitative criteria, these guides help define what’s green and what isn’t. Here are some authoritative resources:

• Building Products & Materials: www.buildinggreen.com
  The online GreenSpec Directory provides descriptions of over 2,100 environmentally preferable products, as determined by its editors.
  
• Carpets & Rugs: www.carpet-rug.com
  The Carpet & Rug Institute operates a Green Label program identifying carpet, cushions, and adhesives with very low emissions of the volatile organic compounds that contribute to poor indoor air quality.
• Cleaners & Soaps: www.greenseal.org
  Green Seal utilizes a life-cycle approach, evaluating product or services beginning with material extraction, continuing with manufacturing and use, and ending with recycling and disposal.
  
• Doors: www.greenseal.org
  Green Seal utilizes a life-cycle approach, evaluating product or services beginning with material extraction, continuing with manufacturing and use, and ending with recycling and disposal.
• Floor Care Products: www.greenseal.org
  Green Seal utilizes a life-cycle approach, evaluating product or services beginning with material extraction, continuing with manufacturing and use, and ending with recycling and disposal.
• Green Power: www.green-e.org
  Green-e is a voluntary certification and verification program for green power products based on renewable energy certificates (RECs) or delivered electricity.
• Lights: www.darksky.org/programs/fixture-seal-of-approval.php
  The International Dark Sky Association developed the Fixture Seal of Approval (FSA) program for luminaires that minimize glare, reduce light trespass, and don’t pollute the night sky.
• Paints & Coatings: www.greenseal.org
  Green Seal utilizes a life-cycle approach, evaluating product or services beginning with material extraction, continuing with manufacturing and use, and ending with recycling and disposal.
• Paper & Printed Products: www.fscus.org/paper/
  The Forest Stewardship Council (FSC) sets forth principles, criteria, and standards for guiding forest management to address economic, social, and environmental concerns. FSC-certified products are made of pulp or paper originating from FSC-certified sources of wood and wood products.
• Paper Products & Papers: www.greenseal.org
  Green Seal utilizes a life-cycle approach, evaluating product or services beginning with material extraction, continuing with manufacturing and use, and ending with recycling and disposal.
• Windows: www.greenseal.org
  Green Seal utilizes a life-cycle approach, evaluating product or services beginning with material extraction, continuing with manufacturing and use, and ending with recycling and disposal.
• Wood & Wood Products: www.fscus.org/green_building/
  The Forest Stewardship Council (FSC) sets forth principles, criteria, and standards for guiding forest management to address economic, social, and environmental concerns. FSC-certified wood and wood products are sourced from well-managed forests.