Agence France-Presse: British Prime Minister Gordon Brown causes more greenhouse-gas emissions than three other major European leaders, according to a report on Monday in Terra Eco, a French environmental monthly. Last year Brown emitted more than 8,400 tonnes of carbon dioxide (CO2) or its equivalent on official trips, it said. German Chancellor Angela Merkel was second, with 7,400 tonnes, followed by French President Nicolas Sarkozy, 7,100 tonnes and Spanish Prime Minister Jose Luis Rodriguez …