Combustion? YES, but this is not the only rection involved, and there is another, seperate reaction
Photosynthesis? NO
You need to back up a bit, as my clue was maybe a bit too close up for now. It will help you when you are closer to the answer.

Not a specific human, but a specific group.

[irach] Single-sex? No.
[Dujon] Dammit!? No.

[Rosie] Figurative Combustion? NO, literal
[INJ] Visible phenomenon? If you are thinking northern lights, then no.
[SW] Specific Nation? No, even smaller than that.

(also, could you actually answer INJ's question? :-) )

[CdM] Artistic? No
Well, I wouldn't define it as a visible phenomenon.

[irach] Ozone? NO

Burn it all down? NO

[irach] Fossil Fuels? Yes, but this is not the only mineral connection.
[Raak] Industrial? NO

[Rosie] Smelty, smelty? NO, but metals are involved.
[irach] Water? YES, and in its liquid state
[Software] Artisanal? I'm not quite sure how you mean, but I can say that one artist that I know of is connected, but others are also connected. Please note that people are both directly and indirectly connected to this, but it will be easier if I refer to the people directly connected, because those are the ones I am able to confidently answer about.

[Rosie] Light the Rocket? No. But you are close on one aspect...

[irach] Not initially, although most of them end up in direct contact with water or an aqueous solution.

[irach] under the sea? NO
[SW] It's NOT rocket science.

[irach] Lead balloon? NO