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Fuel cells vs batteries in 2030's vehicles

Question

Elon Musk and others have publicly derided fuel cell electric vehicles (FCEVs) versus battery electric vehicles (BEVs). For example, Musk expects Toyota to fold their hydrogen powered Mirai in coming years. Yet some have argued that hydrogen fuel cells will eventually dominate electric transportation.

What global share, in annual revenues, will such vehicles have in truck transportation in 2030? For all ground transportation? For air transportation? For surface sea transportation?

We'll add these all up to ask:

What percentage of the global electric transportation market will hydrogen fuel cell electric vehicles (FCEVs) be, in annual sales revenues, in 2030?

Resolution will compare a credible and objective estimate of the total annual saves revenues in fuel-cell drive electric vehicles to all electric vehicles (excluding gas-electric hybrids) in 2030.

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