I can remember articles promoting hydrogen powered cars as the future. They even said Elon made the wrong bet with electric. Some company's are still hawking hydrogen as the future, the difference is no one is paying any attention to them any longer.
Someone else has made the bet for bigger tunnels and they're using a PR agency to push back. PG called out this tactic a few years back:
The bigger tunnel people have proven success, while the small tunnel people just have hype.
People shut up about electric cars over hydrogen when electric proved itself. Note that back when this started there were many hydrogen naysayers who pointed out all the problems the hydrogen proponents have faced. The electric car people got lucky that lithium batteries advanced to where they could work - 20 years ago this wasn't a given to battery experts.
Someone else has made the bet for bigger tunnels and they're using a PR agency to push back. PG called out this tactic a few years back:
http://www.paulgraham.com/submarine.html