Claire I think improving public transportation would be more beneficial overall than giving tax breaks or rebates to particular companies and consumers. If taking a train or a bus is significantly easier, cheaper, and faster than driving a car, more people will want to use public transportation. With fewer cars on the road, there will be less air pollution.
Paul I believe that providing financial support to electric-car manufacturers and consumers is the better innovative long-term strategy. Many people live in rural areas, and they need their own vehicles to get around. These people would not benefit from, say, more train lines being built in a far-off city.