Think of slaking a great thirst by pouring a tall glass of spring water onto a sponge, and then gnawing the sponge to get the water back out of it. That is the animal agriculture model. Europe has no choice but to innovate another way. Protein will not be an issue.
The free radical—starved of a single electron—goes roaming around your interior like a staggering ghoul until it finds an unsuspecting, ordinary molecule walking innocently by. What does this free radical molecular jerk do next? It steals an electron from that poor guy. A systemwide replay of this thievery becomes cellular oxidative stress, triggering a cascading host of serious illnesses. How do we stop this madness? How??! Not to sound too panicky.
A sun can throw unmediated energy at a cold wet rock for a million eons, and what do you get? A warm wet rock. Energy needs a mechanism to feed, to put it as unsentimentally as possible. So here’s a nutty idea—how about an ingenious (and generous) mediating force that eats the raw energy of the sun and turns it into stuff an animal can chew? We call these "plants".