Tesla and BYD steal the headlines as they race for global leadership in battery electric vehicles. But on the near horizon there is another technology that delivers zero emissions: hydrogen fuel cells. General Motors has been developing fuel cell solutions for more than 20 years. They are doing important pilot testing of fuel cell applications for Class 8 trucks, with the US military on battlefield applications and in mobile charging units. My guest this week, Charlie Freese, is an expert on all vehicle propulsion systems and is currently focused on hydrogen. In our conversation, I ask Charlie what he drives to work every day, how soon he sees himself behind the wheel of a vehicle powered by fuel cells and where hydrogen fuel cells are a better solution than battery electric vehicles.