Biodiversity stamps

Postage stamps are a good way for mainstreaming biodiversity. At least this is the opinion of Metsähallitus Natural Heritage Services . In cooperation with the Finnish Postal Services they just brought out a new stamp in their series of national parks. I wonder what the impact is in the age of internet. On the web it is easy to find a few more examples from other countries. The use of logo of the IYB makes at least some sense to me.