Ria Novosti: Activists from the climate action group Plane Stupid climbed onto the roof of Britain’s Parliament on Wednesday in protest against the construction of a third runway at London Heathrow Airport. The environmentalists, three men and two women, who spent three hours on the roof before leaving during a traditional session of Prime Minister’s Question time, were arrested by police. They said the airport expansion would inevitably lead to an increase in greenhouse gas emissions and could …