3 ms·

Where are they getting their "nutrients and vitamins"?

• TheSpiceIsLife 7y ago
  Industrial suppliers, presumably. Some vitamins can be created synthetically, others by modified bacteria or yeast. I think your wider point still stands: what is the total carbon / energy / environmental foot print per food-unit equivalent.
• jquery 7y ago
  If they wanted to be super green, they could use the waste products of animals.