Guardian: In Krakow, Poland, lawmakers recently banned the burning of coal to heat homes after activists pressured them with a Facebook campaign that drew 20,000 followers. Driven by a survey that showed the city's air to be the third dirtiest in Europe, the small group of volunteers worked late into the evenings, on top of their day jobs, in an effort that had no funding at all until weeks after its big victory.
The relentless campaigner Simon Birkett, from London, messaged top European officials as they...