New research from Harvard University indicates that the amount of mercury in the environment is much higher than previously thought. Prior estimates put mercury levels at around 720,000 metric tons; the new study suggests it’s actually two-and-a-half times that number.
Hybrid cars, buses and trucks are as much as 30% more energy efficient than their conventional counterparts. The bulk of this energy savings comes from regenerative braking. This is the process of recapturing the energy that is lost to friction in the process of slowing or stopping the vehicle. Instead of heating up brakes, the wheels slow down by turning a generator and making electricity that can be put to use to power the vehicle or other onboard systems.