Alan Andrews

government administration

Environmental law organization

Public opinion research

Engines that use diesel fuel, promoted by Chrysler as providing comparable fuel economy to hybrids without sacrificing performance.

A public transportation bus powered by hydrogen fuel cells rather than conventional diesel or gasoline engines. These buses are essentially electric vehicles that produce their own electricity on board.

Buses powered by electricity, receiving substantial subsidies under the Chinese program.

England

Buses that combine a conventional internal combustion engine with an electric motor, used in London's fleet to reduce emissions.

Buses powered entirely by electricity, representing a cleaner alternative to diesel buses.

Used to transport officials and powered by hydrogen.