Experimental protein reactors produce basic food from carbon dioxide and electricity

I guess you can't call it Soylent Green.  Well, it's not green....

The protein’s greatest selling point is in its ingredients.

Sunlight. And carbon dioxide.

“In practice, all the raw materials are available from the air,” Pitkänen says. “In the future, the (solar powered) technology can be transported to, for instance, deserts and other areas facing famine. One possible alternative is a home reactor, a type of domestic appliance that the consumer can use to produce the needed protein.”