[reeddavid]

I think your comment describes something very similar to what Solar Foods is doing (https://solarfoods.fi).

There was a previous discussion with some more details about what they're doing: https://news.ycombinator.com/item?id=18344636

[rklaehn]

Nice. Did not know about this. There is another company https://www.calysta.com/ that have a similar product called feedkind.

Basically animal food that is made in a bioreactor from methane. Methane can be easily made from hydrogen and carbon dioxide via the sabatier reaction.