For months, Germany has feared having to ration energy amid Russia’s increasing willingness to turn off the tap. Now those fears are becoming a reality as Germany prepares for a return to 1970s-style energy rationing, when the OPEC oil embargo forced governments to mandate measures like dimmer lights and car-free Sundays. Only, the energy crisis of 2022 isn’t limited to oil. Last year, Germany relied on Russia for 55% of its natural gas imports. Germany has since been able to reduce that number to 35%, but with Russia seemingly prepared to further cut gas shipments to Europe, German officials are...