Agence France-Presse: Four activists from environmental campaigners Greenpeace breached security at London Heathrow to stage a protest on top of a jet against the airport’s planned expansion, the group said Monday. The activists climbed on top of a British Airways Boeing 777 plane which had just landed from Manchester at around 0945 GMT and unfurled a huge banner across the tailfin reading: “Climate Emergency — No Third Runway”. Their action came two days before the end of a government …