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From the web to wildlife, the economy to nanotechnology, politics to sport, the Observer’s team of experts prophesy how the world will change – for good or bad – in the next quarter of a century 1 Geopolitics: 'Rivals will take greater risks against the US' No balance of power lasts forever. Just a century ago, London was the centre of the world. Britain bestrode the world like a colossus and only those with strong nerves (or weak judgment) dared challenge the Pax Britannica. That, of course, is all history, but the Pax Americana that has taken shape since 1989 is just as vulnerable to historical change. In the 1910s, the rising power and wealth of Germany and America splintered the Pax Britannica; in the 2010s, east Asia will do the same to the Pax Americana. The 21st century will see technological change on an astonishing scale. It may even transform what it means to be human. But in the short term – the next 20 years – the world will still be dominated by the doings of natio