I know what you mean. When it's scaled up, stuff has a tendency to go wonky.

Here's a possible thing. But even if solar capture worked, by the time it was implemented on a large enough scale to replace fossil stuff, the albedo of the planet would be screwed, thus affecting global climate. Though I suppose some kind of balance could be worked out by painting large tracts of the planet a darker colour.

Oh, and not forgetting the dolmens, they'd have to be painted darker too.