[Editor's note: Fun site from the United Nations Environment Programme highlighting changes in the natural environment with side-by-side remotely sensed imagery and full write up of each place. Done both in Google Maps and available as a Google Earth feed. Map is fairly decent.]
Republished from United Nations Environment Programme.
Increasing concern as to how human activities impact the Earth has led to documentation and quantification of environmental changes taking place on land, in the water, and in the air. Through a combination of ground photographs, current and historical satellite images, and narrative based on extensive scientific evidence, this publication illustrates how humans have altered their surroundings and continue to make observable and measurable changes to the global environment.