The Shark Savers organisation has a simple but effective idea to combat the revolting practice of shark finning for the ever-popular, though tasteless, shark's fin soup. The shark fin trade, which by the kilo can be more lucrative than selling cocaine, exists to service the demand; changing people's minds is the only way to tackle the demand, which is perpetuated at the moment by the sick cycle of "it's expensive therefore it's desirable/It's desirable therefore it's getting more scarce/It's getting more scarce therefore it's more expensive/It's desirable therefore it's expensive".
Yao Ming, who's a hero in mainland China, is appearing in a Shark Savers campaign against eating shark's fin. For US$100, you can sponsor a billboard advert featuring Yao at a bus stop in Beijing or Shanghai - this includes production, installation, maintenance, and lighting for a year. There are incredible statistics on the site showing that these billboards do actually change people's minds about eating shark's fin. Sadly, Hong Kong's billboards are nothing like as inexpensive as this, although as the hub of the shark's fin trade (and Hong Kong diners consume 3 million kilos of shark's fin a year), such a campaign is sorely needed here too.
If you sign up now, one of Shark Savers' sponsors has pledged to provide another billboard to match yours. What are you waiting for?