Hybrid electric vehicles are being developed to reduce emissions and save fuel. Different technologies like engine stop/start and regenerative braking are being used to make cars more efficient. There are four levels of hybridization that offer different CO2 benefits. In North America, Ford offers full-hybrid vehicles, while in Europe, micro-hybrid technology is cost-effective for reducing CO2 in cars like the Fiesta and commercial vehicles like the transit. This technology is a smart and affordable choice for many types of vehicles.