London, the "Big Smoke," is the capital of the United Kingdom and the second largest city in Europe. From Brixton to Big Ben and Bethnal Green to Heathrow, there is always something brewing in the "Great Wen."
Samuel Johnson is quoted too often for writing that "when a man is tired of London, he is tired of life," but the truth is that the British capital exhausts several million men and women - workers, tourists and the unemployed alike - on a daily basis. The city's comprehensive Underground moves 1.3 billion passengers per year over 402 kilometers of track, for just one metric of London's massiveness. And the 8.5 million people who call greater London home always have something to complain about – except having nothing to do.
Berlin is looking to profit from the UK's vote to leave the European Union by tempting companies away from London. The city is setting its sights on tech and fintech start-ups, hoping fears about post-Brexit Britain will make the German capital an attractive place to start a business.
Client Earth has taken the UK government to court for allegedly failing to tackle a crisis in air quality. The nonprofit says the government has downplayed the role of diesel emissions in causing high pollution levels in cities like London. Nik Martin traveled to the English capital to meet with some clean air campaigners trying to bring about change.