For me it was Apolo 8 Earthrise. http://www.nasa.gov/multimedia/imagegallery/image_feature_102.html http://www.nasa.gov/multimedia/imagegallery/image_feature_10

For me it was Apolo 8 Earthrise. http://www.nasa.gov/multimedia/imagegallery/image_feature_102.html http://www.nasa.gov/multimedia/imagegallery/image_feature_10... For sheer horror there was a National Geographic story about pollution in Easter Europe somewhat later.