US Geological Survey
U.s. Geological Survey: Repeat Photography Project
The Repeat Photography Project pairs historic images with contemporary photos thus documenting glacial decline through photography while communicating the effects of global warming.
Other
The Canary Project
If you're looking for photographic evidence of global warming, then this is a good resource to check out. Photographs from around the world document the effects of global warming.
Khan Academy
Khan Academy: Gallery: The Modern World
Innovations in transportation, communication, and weapons transformed the world in the 20th century. The modern era is the most complex yet, and the most fragile. This photo gallery highlights some of these innovations.