“They’ve managed to grow a nutrient rich protein called solein, which is made from a single microbe using carbon dioxide - from the air - and hydrogen that is split from water using electricity.”
Proteins all have nitrogen, but I suppose they get that from the air as well. Making them from inorganic sources must be rather energy intensive.
No doubt largely fossil fuel generated energy.
You know the thing that gets me over and over in all this energy and climate change BS, is why fusion energy has not become the norm or widespread yet.