Former F1 world champion Jenson Button predicts more carmakers will join Lotus in Extreme E Jenson Button believes we will see more car manufacturers join the Extreme E off-road racing series. Photo by Clive Mason - Formula 1/Formula 1 via Getty Images Team owner and 2009 Formula One world champion Jenson Button expects the new Extreme E off-road racing series for electric SUVs to see an influx of manufacturers in the next year or two. Button's JBXE team is partnered by Lotus Engineering, a subsidiary of the British sportscar maker, in a series that races in remote locations to highlight climate change and promote sustainability.