Former Formula 1 world champion Nico Rosberg says that Formula E and F1 could merge in the future.
The 2016 F1 champion is still involved in the series as a pundit, but he also has a stake in the all-electric FE, as does Liberty Media's sister company Liberty Global.
Speaking after Formula E announced a five-year sponsorship deal with Heineken (which is also a major sponsor for F1), the German played down talk that in time the electric series could eclipse F1.
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"Maybe we will never even get to that point and we will just see a merger between Formula 1 and Formula E before that," he told the Associated Press.
"When the moment comes that Formula 1 needs to go electric, which will happen, maybe you will just see a merger then.
"The step for Formula 1 to go electric will be a big and difficult one," he added. "If that ever happens."
Rosberg added that increasing concern for the environmental impact of F1 could result in the two series coming together in the future.
"It's a real problem [burning fossil fuels and its contribution to global warming] out there in the world," warned the racing driver, "and we need to do what we can as fast as possible to help all together.
"If the whole world is selling and driving electric cars, it doesn't make sense for Formula One to be combustion engines, so that moment will come. The advantage is that Formula One and Formula E have the same owner, John Malone."