[andrewjl]

You can't eat sunlight or the wind either yet both seem pretty useful.

[igorkraw]

And where do you plant the crops or build the wind turbines and solar plants to harness these?

[prichino]

And to add, and where do you get the materials to build the wind turbines and solar plants?

[andrewjl]

You're begging the question here. Currently we need land for these but that can change.

[igorkraw]

No, I'm simply asking the inconvenient question, that's different. How can it change?