Reuters: Owners of gas-guzzling cars will have to pay 25 pounds ($50) a day to drive them in central London from October in a push to cut carbon emissions, mayor Ken Livingstone said on Tuesday. Livingstone admitted it would have little immediate impact on emissions but said the lifestyle signal and other moves such as recycling initiatives and new building rules would help cut London’s carbon emissions by 60 percent by 2025. "I believe that this ground-breaking initiative will …