The purpose of these resources is to assist clients in obtaining world-class information about environmental sustainability.  The resources are designed to be background to the work of the EcoLens Group.
Several organizations have developed meaningful guidelines for environmental sustainability:

Some guidelines relate to rules for governing human interaction with the ecosystem:

Wingspread Principles
Natural Step
One Planet Living
The Earth Charter
The CERES Principles
The Sanborn Principles
The Equator Principles

Some important legislative references and conference agreements.

The United Nations Framework Convention on Climate Change
Environmental Protection Agency  
Pew Center On Global Climate Change
National Renewable Energy Laboratory
Carbon Disclosure Project Global Report
The Greenhouse Gas Protocol Initiative

Guidelines for the Built Environment

Leadership in Energy and Environmental Design (LEED)

Some Readings that May Be Helpful

Renewable Energy:  Wengenmary and Buhrke (eds) Renewable Energy;  Fred Krupp, Earth: The Sequel  These two books are very good overviews of the basics of renewable energy.
Richard W. Asplund.  Profiting from Clean Energy.  Excellent explanation of the various markets that are evolving related to clean technologies. 
Thomas L. Friedman.  Hot, Flat and Crowded.  The author who wrote The World is Flat.  See the second section of the book where Friedman discusses solutions to seemingly intractable problems.
Peter Senge, Bryan Smith, Nina Kruschwitz, Joe Laur, and Sara Schley.  The Necessary Revolution.   An excellent book about how individuals and organizations are creating a sustainable world.  This practical guide is a good start on strategy and sustainability.