Sea Save has launched a campaign to support the passage of the Shark Fin Sales Elimination Act. It aims to ban the buying and selling of shark fin within the US. The Act was passed through Congress during the last session, but the Senate took no action. One way to ensure that the Act gets the attention it deserves from politicians is to send your elected representative an email expressing your support.
For those of us outside of the US, the Sea Save campaign also has an option to tell US lawmakers that you support the Act. Simply scroll down on this page and add your details.