The First World War temporarily stopped the development of London. Still there was the Great depression: the level of unemployment has strongly grown, the standard of living has fallen. There were radical parties that were at war with each other. During the Second World War, the capital of Great Britain was subjected to repeated air bombings. Immediately after the war, London for the second time hosted the Olympic Games. A great smog, an extremely harmful mixture of fog and industrial smoke, descended for five days to London. Soon, the concentration of combustion products in the air became so high that over the next few weeks about 4 thousand people died from smog in the city, and another 8 thousand were victims of the disaster in the next few months. The result prompted the authorities to seriously tackle this problem, which resulted in Issued a nationwide law "On Clean Air" (1956), as well as a similar urban law. In the 1960s, thanks to popular musical groups such as the Beatles and the Rolling Stones, the city became one of the world centers of the youth subculture (receiving a nickname Swinging London "). The new millennium London greeted the opening of several new buildings, such as the Millennium Dome (Millennium Dome) and the London Eye (London Eye), a Ferris wheel, which has become a new symbol of the city.