"How no?" is a Scotticism for "Why not?"

Solarpunk is a movement focused on a positive, ecological vision for a future where technology is used for human-centric and ecocentric purposes. It is a literary, artistic and aesthetic sub-genre and is also closely tied to eco-political activism. Solarpunk narratives have a distinctly positive and utopian foundation in contrast to the often dystopian visions found within other "punk" science fiction genres.

Comes from 'kako ne' meaning 'how no' in Macedonian.
When in some sort of dispute where there is no chance the contrary can do what they are requesting.