The environmental benefits of the project are also disputed and the environmental impact assessment (EIA) revealed that Gautrain would at best be environmentally neutral. South Africa uses coal-based electricity generation and the electricity required for Gautrain would come from outside the Gauteng region. The pollution associated with the generation of this electricity would therefore effectively be exported to the Mpumalanga region, an area already under severe strain from air pollution. According to the Gautrain's website, the Gautrain has half the carbon footprint versus a motor vehicle.