As the build-out of infrastructure for electric passenger vehicles gets underway, another segment of transportation is just starting down the road to electrification: heavy duty trucks. It’s one of the hard-to-decarbonize parts of our economy. Right now, nearly all long-haul trucks run on fossil fuels. And if we continue with business as usual, freight will become the highest-emitting part of the transportation sector by 2050. That’s why seven states, led by California, have mandated that an increasing number of zero-emission trucks be sold between now and 2035. What does the road to zero emissions trucking look like?