What do stadiums say about us? London's Olympic venue has been unveiled with much fanfare, but what do national stadiums really say about the countries they are in?
Humanity is the greatest challenge It is time to take radical action to curb rising population and consumption levels, or face "unspeakable consequences".
Europe diary: Turkish tensions BBC Europe editor Mark Mardell finds Turks wary of the Pope's historic visit and grapples with the religious row sparked by the pontiff's speech in Bavaria.
