Going green: Can we travel the world without killing the planet?
They come in the form of small cards, rocks or pieces of wood — the hotel reminders that guests can choose to skip having their towels and sheets washed every day, in a bid to save water and energy. Over the years, they've become expected as a base level for a hotel or lodge to show that it's interested in being environmentally responsible. Guests even notice when, after they have hung their towels to avoid daily washing, they're still replaced with fresh ones.
How much effect do these hotel linen programs really have?