A Beginner’s Guide to the Hydrogen Economy

Hydrogen. What are you even supposed to think about it? If you’ve spent serious time focusing on climate policy, you’ve heard the hype about hydrogen — about the miraculous things that it might do to eliminate carbon pollution from cars, power plants, steel mills, or more. You’ve also seen that hype fizzle out — even as governments have poured billions of dollars into making it work.

On this week’s episode of Shift Key, Rob and Jesse give you a rough guide for how to think about clean hydrogen, which could help decarbonize the industrial — even the molecular — side of the economy by storing energy and helping to make clean steel and chemicals. Do we really need hydrogen to fight climate change? Where would it be useful? And why has it failed to take off in the past? What will Trump and China mean for global hydrogen policy? Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap, and Jesse Jenkins, a professor of energy systems engineering at Princeton University.

Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.

You can also add the show’s RSS feed to your podcast app to follow us directly.

Here is an excerpt from our conversation:

Jesse Jenkins: This is the next crazy thing that I think is just starting to kind of bubble up to the public awareness: Basically, hydrogen itself is not a climate forcer. It doesn’t warm the planet the way methane or [hydrofluorocarbons] or CO2 does. But it does react in the atmosphere in ways that increase the concentration of greenhouse gases.

Robinson Meyer: I think specifically that right now, we talk about when methane leaks into the atmosphere. And it may apply to other greenhouse gases, too, but the big one that you tend to hear about is that when methane leaks into the atmosphere from natural gas — and of course, we’re very worried about methane leaks. Because the thing about methane is that it traps a lot of heat, but it breaks down really quickly, right? So it tends to break down, unlike carbon dioxide, which, when you release it into the atmosphere. sticks around for millennia. When you release it into the atmosphere, it captures a lot of heat, but then breaks down into a smaller amount of CO2 after about 20 years.

The issue, and why it breaks down, that — we never talk about this, or we had no need to talk about this until hydrogen — and it’s crazy because the world is a closed system, or a largely closed system, right? Why it breaks down is it reacts with the free hydroxyl radicals floating around in the atmosphere.

Jenkins: Right, OH molecules.

Meyer: Well, what else reacts with OH molecules? Hydrogen. And so if we leak too much industrially produced hydrogen into the atmosphere, it could mess with the rate of breakdown of all methane in the global atmosphere, and thus increase the global warming potential of natural gas.

Jenkins: It makes the methane last, traps more heat, yeah. So let the record show that Robinson Meyer, the journalist, accurately captured the atmospheric chemistry of this process better than Jesse Jenkins, professor at Princeton. Nicely done.

This episode of Shift Key is sponsored by …

Intersolar & Energy Storage North America is the premier U.S.-based conference and trade show focused on solar, energy storage, and EV charging infrastructure. To learn more, visit intersolar.us.

Music for Shift Key is by Adam Kromelow.