Two smart ideas from Saatchi and Saatchi, Copenhagen, Denmark .

The first is a simple but smart cutout in a bathroom paper towel dispenser. As the towels get used, the level of green slowly disappears representing the destruction caused by use of similar disposable paper products.

The second is this billboard about climate change and rising sea levels. It uses a shade canopy to create the illusion of rising water. See the video demo below.