What sells cars these days? That's right: the cleanliness of their emissions and perhaps the ability to live in a plastic bubble filled with their exhaust. That's why Hyundai decided to demonstrate just how clean its hydrogen-powered Nexo SUV is by ... putting an Olympic swimmer in a plastic bubble and feeding the Nexo's exhaust into that bubble via a tube. They made the Olympic swimmer, Mireia Belmonte, run on a treadmill inside of that bubble.

If that doesn't convince you to buy a Hyundai Nexo, we don't know what will.

Of course, this is possible because water is the only emission of the Nexo, so water vapor is all that comes out of the tailpipe. After that, the case for a hydrogen car begins to break down a little.

Please don't try this at home, even if you're somehow one of the ... several thousand people who actually owns a hydrogen car in the U.S. And by U.S., we mean California.

And by California we mean three Hyundai dealerships in California. Since the Nexo has a range of 380 miles, it can make it from the Bay Area, where one of the dealerships is located, all the way down to LA, if you don't take any long detours. But you won't be able to venture far out of California, and let's face it: Why would you ever want to leave California, aside from the periodic water shortages and some seasonal fires?

We think we have an idea: If there were millions of Nexos on the roads of the state, they could produce all the water that California needs, right?

The Nexo is also the sole hydrogen fuel cell SUV on the market today, so Hyundai owns 100 percent of that segment. Which is good news for Hyundai. And it starts at $59,395, before any state rebates. Hyundai offers three years/$13,000 worth of complimentary fuel at hydrogen filling stations in California, which, if you do some quick math, reveals how much a year's worth of fuel costs.

Speaking of hydrogen fuel stations, California is where the vast majority of hydrogen fuel stations are located. And by majority we mean a majority of almost 40 stations that exist in the whole country.

So it's a bit like if electric cars only had about 40 charging stations, most of them were within a few ZIP codes in California and no vehicle owner had a charging station at home. Needless to say, there are some trade-offs that have to be made with hydrogen cars, starting with a somewhat limited geographic range and an aversion to batteries.

Nevertheless, automakers are not abandoning hydrogen cars, in case the whole battery-electric thing doesn't work out.

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