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Ammonia - NH4 - is often proposed as a solution for shipping. Note there is no carbon in the chemical formula, thus there is no carbon dioxide resulting from burning it.

Hydrogen will be made from renewables by 2030.

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There is an N in that formula, though, so burning ammonia is going to result in nitrous/nictric oxide. NOx is also a greenhouse gas (indirectly, apparently), and the hazy brown component of smog. One of the oxides is laughing gas. On the whole, I think pumping CO2 into the atmosphere is better than pumping smog and laughing gas.

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