To Kill Green Dragons? There are two choices practical: Chaos Tunnels or OSRS gold the Green Dragons of level 20 Wilderness. Green Dragons in Chaos Tunnels are filled by Baby Black Dragons. These Dragons are able to eat the food source of your character. Wilderness is home to only Green Dragons. But, there are Revenants too.
The Chaos Tunnels are located close to Edgeville as well as the Grand Exchange. The Green Dragons in Wilderness are an extended walk from Varrock but a shorter walk from Bounty Hunter. Green Dragons in the Wilderness normally have quite a few people in cheap RS gold them, but about 10 Green Dragons. Green Dragons within the Chaos Tunnels have few people, but there are only three Dragons.