During the UN Climate Change Conference 2009 (COP15), the Danish government invites the entire world to send their greetings to the conference. Greetings are submitted through http://www.greetings.cop15.dk/and are composed of 150 characters of text. The Climate Greetings will be shown on large screens throughout COP15 as well as at various other venues in Denmark and around the world.
http://en.cop15.dk/climate+greetings/about+greetings