Intriguing idea! I'm very curious to see how you'll connect the "micro" and "macro" (how small daily actions can have larger consequences). I'm not entirely sure I fully understood the concept to be honest though -- I'm having a hard time understanding how the players' real life actions will be tracked or recorded within the game (for example, if they drink a water bottle, will they have to register it themselves in the game? Which might be hard to incentivize especially if they know it'll impact their island.) Maybe you cannot "degrade" the island but only restore it slowly over time, which might enforce a positive loop instead.