Site Protection: Our calculations show that LEED measures have to date prevented nearly 500,000 tons of soil erosion and will avoid between 4 million and 6 million tons of soil loss by 2015 to 2020. In addition, more than 5,000 acres of sensitive land have been left undeveloped, an amount that will grow to more than 70,000 acres by 2020.

LEED has resulted in an estimated 250 acres of brownfield reclamation, which we expect to grow to more than 3,000 acres by 2020. Other site restoration activities have created more than 400 acres of additional open space in urban areas to date, and will reach an anticipated level of 5,500 acres in the next 12 years.

Site "Performance": Stormwater runoff and urban heat islands are two important elements of site performance evaluated by LEED. We calculate that for each storm producing greater than three-quarters of an inch of rainfall, LEED stormwater prevention and treatment requirements avoid or treat approximately 100 million gallons of "toxic flush" -- rain that rinses the chemical and particulate deposition from the sky into sewers and eventually, in most cases, to rivers and oceans. By 2020, this volume treated grows to approximately 1 billion gallons per storm event.

About 5,000 acres of land and rooftops have implemented measures to reduce urban heat islands. We expect more than 35,000 acres of similar measures by 2015 and 50,000 by 2020.