 In countries with incentives to fight against global warming and contamination and promote vehicle fuel efficiency, the pay-back period can be immediate, and all-combustion-engine vehicles can cost more than hybrids because they generate more pollution.Toyota and Honda have already said they've halved the incremental cost of electric hybrids and see cost parity in the future (even without incentives).The rare-earth element dysprosium is required to fabricate many of the advanced electric motors and battery systems in hybrid propulsion systems.