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It is not the only company investing in hydrogen. Elon Musk's Tesla is leading the charge in developing the next generation of car technology. But, don't overlook the other contenders. Its rivals are also investing.Volkswagen's Audi brand said it had put together a team of more than 100 mechanics and engineers who were researching hydrogen fuel cells for the whole VW group.Hydrogen is also seen as a sure bet by top truckmakers like Daimler and Volvo, who see batteries as too heavy for long-distance commercial vehicles.For now, though, fuel cell technology is expensive, making the production of mass-market cars a challenge.The cells - where hydrogen passes through a catalyst to produce electricity - are complex and contain expensive materials.VW group CEO Herbert Diess has Tweeted that it isn't the solution to climate change.But Toyota takes a different view.It already has a fuel cell car on sale, though it remains a niche market. Stephan Herbst, the European general manager, believes that both hydrogen and battery electric cars could be developed side-by-side. He is part of Hydrogen Council's business group. It predicts that hydrogen will power over 400 million cars by 2050.