The implausibility of a net-zero carbon energy future is becoming so obvious that even Europeans are starting to notice. Witness the weekend decision to step back from the ban on internal-combustion automobile engines that the European Union had intended to implement by 2035. The eurocrats in Brussels had formulated the ban as part of their plan to reach net-zero carbon-dioxide emissions by 2050. But what regulators imagine would replace conventional engines remains a mystery. Battery technologies don’t exist to replace fossil fuels in driving distance or ease of refueling, and no one can say if or when such batteries will materialize. EVs also need subsidies for consumers and for production across the supply chain to be profitable, as we reported last week.