Electric cars are growing in popularity as the cost of batteries falls and performance increases. But as governments around the world race to slash carbon emissions - engineers are faced with a challenge of improving how far the cars can go. Al Jazeera’s Neave Barker has more from London. - Follow us on Twitter: https://twitter.com/AJEnglish/ - Find us on Facebook: https://www.facebook.com/aljazeera/ - Check our website: https://www.aljazeera.com/ #ElectricCars #ClimateWarning #ClimateChange