The U.S. Green Building Council has gotten a lot of attention through promotion of its LEED standard.  I am personally aware of several organizations that have focused intense PR campaigns on claims that their buildings have been modified, usually at considerable expense, so that they are LEED-certified and thus more energy efficient.  Here's the claim as to the meaning of LEED certification on USGBC's website:

LEED, or Leadership in Energy and Environmental Design, is an internationally-recognized green building certification system. Developed by the U.S. Green Building Council (USGBC) in March 2000, LEED provides building owners and operators with a framework for identifying and implementing practical and measurable green building design, construction, operations and maintenance solutions.

Consequently, buildings that are LEED certified are understood by the general public as indicating that a building is especially energy-efficient. Today I read a disturbing article in Mother Jones (not yet available online): "Leeding us On."  The article focuses on allegations made by Henry Gifford, a New York City energy efficiency consultant, who calls LEED "a joke." Here's an excerpt: [More . . . ]