See the meat-eater problem tag and the posts tagged with it. That being said, wild animal effects can complicate things.
Globally, there are around 20 billion farmed chickens alive at any moment, mostly factory farmed, so about 3 per human alive, higher in high-income countries and lower in low-income countries. There are also probably over 100 billion fish being farmed at any moment, so over 12 per human alive. See Šimčikas, 2020 for estimates.
See the meat-eater problem tag and the posts tagged with it. That being said, wild animal effects can complicate things.
Globally, there are around 20 billion farmed chickens alive at any moment, mostly factory farmed, so about 3 per human alive, higher in high-income countries and lower in low-income countries. There are also probably over 100 billion fish being farmed at any moment, so over 12 per human alive. See Šimčikas, 2020 for estimates.