By Matt Hardy Electric racing series Extreme E this morning announced it has cut its carbon footprint by another 8.2 per cent. The off-road series – which has teams under the ownership of the likes of McLaren, Lewis Hamilton, Nico Rosberg and Jenson Button – also saw 30 per cent of the series three’s energy needs fuelled by hydrogen, up from around 10 per cent in series two. The data was reported this morning in a sustainability report in conjunction with EY. Dr. Matthew Bell, EY’s global climate change and sustainability services leader said: “Extreme E remains a powerful example of how a bus…