Bloomberg: Environmental activists patrolled the streets of Berlin and other German cities today to monitor a car badge system meant to curb pollution, a step green lobbies say doesn’t go far enough and motoring groups condemn as unfair. As many as 100 people manned unofficial checkpoints in the German capital, Cologne and Hanover to monitor compliance with new regulations, which require vehicles to carry a badge certifying their level of exhaust emissions. Volunteers handed out chocolates to …