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BERLIN, GERMANY - MAY 25: Nico Rosberg attends the ABB FIA Formula E Championship during day 3 of the Greentech Festival at Tempelhof Airport on May 25, 2019 in Berlin, Germany. The Greentech Festival is the first festival to celebrate green technology and to accelerate the shift to more sustainability. The festival will take place from 23 to 25 May 2019 on the grounds of the former airport Berlin Tempelhof. (Photo by Axel Schmidt/Getty Images for Greentech Festival)

BERLIN, GERMANY - MAY 25: Nico Rosberg attends the ABB FIA Formula E Championship during day 3 of the Greentech Festival at Tempelhof Airport on May 25, 2019 in Berlin, Germany. The Greentech Festival is the first festival to celebrate green technology and to accelerate the shift to more sustainability. The festival will take place from 23 to 25 May 2019 on the grounds of the former airport Berlin Tempelhof. (Photo by Axel Schmidt/Getty Images for Greentech Festival)