No matter who wins, all eyes will be on David Beckham, who will play the last match of his five year Major League Soccer career, and in the process cement his legacy as one of the most important figures in the growth of American soccer.

FORBES: With Beckham's Departure, The Time Is Now For Clint Dempsey

This process of combining of water, cement paste, sand and rock creates an awful lot of CO2 gases - which are linked by some scientists to global warming - about five to 10% of the world's total emissions.

BBC: By Ian Hardy