Why does EV only start to become relevant in recent years?

Posted by Error_Space@reddit | askcarguys | View on Reddit | 79 comments

Personally I don's remember seeing a lot of manufactures focus on EVs before Elon bring up the Tesla models. BMW did try their luck with I8 which as far as I can see was a big flop. So what changed? why all of sudden every car manufacturers seems to losing their mind over EVs? The technology seem to be booming in this field recently so it wasn't some sort of technology barrier, why didn't they done it sooner?