Volvo Cars, the Swedish auto maker owned by China's Zhejiang Geely Holding Group, says that steel used in its cars accounts for about 35% of the carbon-dioxide emissions of the average conventional car over its lifetime, and 20% of those of an electric car. It says it aims to reduce the lifetime carbon footprint of its vehicles by 40% between 2018 and 2025 and wants to be carbon-neutral by 2040.