since 2010. And investors like Tom Blum are talking about it. He's an angel investor who's been funding companies in the clean-tech industry for more than 20 years.
That's made room for a raft of startups, which have built businesses around everything from energy storage to carbon capture. "What's nice about the liquid air is you don't need a big footprint to do this," Blum says. "This is a fairly energy-dense medium."stacking concrete blocks And Blum doesn't typically bet on batteries. He joked: "Send me a list of people who've made money in batteries."
"You're making electricity, but those electrons actually don't make your lights do anything differently," he said. "It's coming from a source that's not releasing greenhouse gases, but you didn't make the light better. So you didn't create this new network of users that opens up a new business model, in most cases.