On the outskirts of this southern Lebanese village, workers in a pickup truck parked at a nature reserve named after a fallen fighter of the militant Hezbollah group. They took two large eucalyptus tree seedlings out of the truck and planted them. The men are from Green Without Borders, a non-governmental organisation that says it aims to protect Lebanon’s green areas and plant trees. But Israel, the United States and some in Lebanon accuse the NGO of being an arm of Hezbollah to hide its military activities. They say the organisation has been setting up outposts for the militant group along t…