Clean technology has genuine successes to its name. Between 1973 and 1980, the fuel economy of the road transport fleet doubled on both sides of the Atlantic, achieved through weight reduction using novel materials, fuel injection and computer engine management. ​Solar PV went from vision to the cheapest electricity source for more than half the planet in two ‌decades. Venture capital investment in Tesla forced every established motor manufacturer into fully electric models. Battery technology, co-driven by venture funds and Chinese industrial policy, has been transformed over the same period.