Actually most of what you claimed was difficult is actually easy. Ships have a bunch of green tech on the way, since they all figured out slow was more efficient anyway. They'll just go at the same speed, but with different powerplants.

Plus, even electric cars (which aren't my fave idea) already have reasonable ranges now with today's tech. Give it five more years for us to figure out expansions and replacement upgrades.

You realize that the weight of batteries or a green power source is negligible to a ship or a train right?

You want to talk about difficult? Help figure out electric airplanes. They already exist, but they're currently only practical for short haul flights. That's still an amazing savings in costs, maintenance, and environmental damage. It's just not ready for transatlantic flights yet.