More and more people are switching to hybrid cars. The unique combination of electric motor and internal combustion engine has several environmental benefits in addition to the high fuel economy. In keeping with this trend, Arlington has introduces the hybrid cab Arlington MA services. EnviroCab is an all hybrid cab service that operates here. It was first sanctioned in 2007 by the Arlington County Board. This is part of the Arlington Initiative to Reduce Emissions (AIRE). The aim of this initiative is to cut down the greenhouse gas emissions from vehicles by 10%. The county has set 2012 at the time limit to achieve this. The hybrid cars in the EnviroCab fleet include Ford Escape Hybrids, Toyota Highlander Hybrids, Toyota Camry Hybrids and Toyota Prii. This cab company claims to be the primary carbon negative taxi firm in the world. Several other cab companies have also started to include hybrid cars in their fleet.