We ARE talking about plans for the future here, not what is available/possible today only.
A lot of innovative thinking and research is ongoing. Who knows what will be possible in 10, 20, or 30 years. (2050 is the target year for emission free shipping and transport)
The US has some great solar potental as shown at the image below, Europe not so much, they used to talk about building solar farms in the Sahara desert to power Europe.