A human concept? Erm, not sure how to answer this one. The animal connection is human, and so I would say YES.

[CdM] Science-y? There is definitely a major connection, but you need to look further than just the thought of science.

[INJ] Metallic? YES, but not exclusively

LOOK AT THIS! Erm.. okay, minor f*** up, realised that vegetable also comes into this. To make up for this, I shall give you a clue. This whole thing is related to heat and oxygen produced by one reaction.

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.