Etats-Unis d'Amérique

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Sustaining Seven Billion People

http://earthobservatory.nasa.gov/IOTD/view.php?id=76605

With seven billion people now living on Earth, the ever growing demand is putting unprecedented pressure on global resources—especially forests, water, and food.

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North American Environmental Atlas: North American Power Plant Air Emissions, 2005

http://www.cec.org/Page.asp?PageID=924&ContentID=25146&AA_SiteLanguageID=1

Welcome to SABINS | SABINS

Data.gov

USGS TNM 2.0 Viewer

CCE - Atlas environnemental de l'Amérique du Nord: Fichiers de données

U.S. - Mexico Border Environmental Health Initiative

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New York City

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http://www.gis.harvard.edu/icb/icb.do?keyword=k235&pageid=icb.page190081

Public Data Resources § Center for Geographic Analysis, Harvard University

The National Map Seamless Server Viewer

Welcome to NHGIS — National Historical Geographic Information System

http://gis.ny.gov/gateway/mg/webserv/?nysgis=

SGIS - Orthoimagery - Web Map Service

GIS web services allow users to connect to data sources through the internet rather than downloading and storing copies of the data on their own systems.