Electric cars pass a crucial tipping point in 23 countries

Convincing everyone to adopt a new technology can be a slog at first. The humble microwave oven, for example, took two decades of lukewarm sales to reach just a tenth of U.S. households. But then came the 1980s, and quicker than you could say ”Hot Pockets,” microwaves had spread to nearly every kitchen.

That fast part of the technology adoption curve…