A visual website showing Environmental Change in Specific Locations

http://earthshots.usgs.gov/tableofcontents

This website offers information on environmental change in specific places in the world; lick on the yellow dots which represent a loaction, this will then bring up a satellite image of the location, with the option of looking at other satellite images taken of this location at different periods in history. Alongside these visual images is an article which details the changes which have taken place and an explanation into why these changes have occured.
These changes are categorised into: wildlife, water, geology, forest, disaster, desert, city and agricultural.

This is a really good site as it provides for a large range of ages.