(PhysOrg.com) -- New York City has a goal to reduce its overall carbon footprint. For Manhattan, the goal is to reduce greenhouse gases 30% by 2017. As part of this effort, the New York City Police Department just added 40 hybrid cars to its fleet. The Nissan Altima Hybrids are the first NYPD alternative fuel patrol cars, but they probably won't be the last. The NYPD plans to deploy at least 100 hybrids in total this year.