The Apollo 17 Blue Marble image of our wonderful home world was the one that changed our view of Earth, literally and deeply.  It was the first one to show the Antarctic icecap.  I’ve replaced the above earth image I had with it.  It was taken and published in 1972.  I remember the impact it made.  Prints of it were seen widely on noticeboards and door. 

   This was before the internet, don’t forget!  It changed everything.  We (the human race) were awed by its beauty.  I believe it started the environmental movement, and widened our view to global instead of national.  The idea of Think Global Act Local became understandable and obvious at that time. It united humanity and gave us new sense of responsibility.