They said it would take a doctor in Broadford, on Skye, or a paramedic stationed in Kyle of Lochalsh, on the mainland, more than an hour to reach Arnisdale.
Events that were planned for Earth Hour included an astronomy and wildlife-watching event near Broadford on the Isle of Skye and a "spooky walk" in the Auld Kirk and the Auld Brig in Ayr.