Faced with climate change, many countries have embarked on the energy transition. Since COP21 in 2015, which set demanding targets for the reduction of greenhouse gases, green energies have been on the rise. The electric car has thus become the mascot of this revolution. But manufacturers remain discreet about the carbon footprint of their cars marked "zero emissions." Because not only do they consume electricity that is not always clean, but they also consume rare metals such as cobalt or lithium, the extraction of which wreaks havoc on the other side of the world. In China, for example, champion of rare metals, in the province of Heilongjiang, a carpet of toxic dust covers the agricultural regions.