Pictures of planet Earth “our home planet” capture our imagination.  This one commemorates Earth Day and its message is simple: we need to love the planet we live on. It’s easy to take our ability to see the whole Earth for granted and to forget that until the ‘Space Age’ at the end of the 1960’s we had simply never seen it that way:  we’d never got the whole thing in perspective. “The Blue Marble”, the photograph that appears in our logo, was taken in 1972 by Harrison Schmitt, one of the astronauts of the Apollo 17 mission.  Robert Poole is his book Earthrise:  How Man First Saw the Earth describes it as ‘A photographic manifesto for…