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This.. It stuck me when I saw Aramco (Saudi oil major) advertising Hydrogen tech on TV.

The brown and black hydrogen will be far cheaper than green hydrogen for some time. They also have the advantage of existing subsidised infrastructure for drilling and pumping. And when the hydrogen vehicles and Power stations become common, the common man have no choice but to purchase this cheaper hydrogen

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The common man has no choice but to purchase what is available to them. With regulation, that will be Green. Without regulation, its unlikely retailers will even bother to stock Green until it is cheaper. Free Market, meet Tragedy of the Commons.

Which is why carbon pricing is the best option in terms of economics. If something's worth going dirty over, let people pay the price.

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