"Fraudsters used faked e-mail messages to obtain access codes for individual accounts on national registries that are part of the European Emission Trading System, then carried out a number of transactions before they were discovered, according to a number of European authorities. "
Security Breach Closes European Emissions Trading Systems
http://www.businessweek.com/ap/financialnews/D9KS7TM00.htm
Hackers Hit Europe's Carbon Market