Some of the world's biggest truckmakers, including Volvo and MAN, are reworking combustion engines to run on low-emission hydrogen instead of polluting diesel, a quicker low-cost fix to their energy transition challenge that may give the dying technology a fresh lease of life. The global truck making industry faces a complex balancing act to get to zero emissions. Electric batteries are too heavy for long-haul freight operations and take long to charge. Using hydrogen fuel cells to generate electricity reduces the weight and extends the range of trucks, but switching to this technology is expensive as companies need to design new truck systems. (....)