[guidoism]

Aren’t plants literally making food out of thin air? They take a series of photons and pull the carbon out of the “thin air” to make food.

[DennisP]

Yes, but inefficiently. The idea is to do the same thing with much less land area, so we can stop using 40% of the planet's land to feed ourselves.

[dekhn]

Yes- it's carbon fixation.