For example, how much do your backyard chickens contribute to global egg consumption, and what would the egg market look like if all eggs came from chickens living like yours? That's the kind of topic going on here.
Avoiding meat and dairy is ‘single biggest way’ to reduce your impact on Earth
https://www.theguardian.com/environment/2018/may/31/avoiding...
The climate benefits of veganism and vegetarianism
https://www.bbc.com/future/article/20220429-the-climate-bene...
https://ychef.files.bbci.co.uk/1600x900/p0c41hws.webp
Estimating the environmental impacts of 57,000 food products
https://www.pnas.org/doi/full/10.1073/pnas.2120584119
Sustainable eating is cheaper and healthier - Oxford study
https://www.ox.ac.uk/news/2021-11-11-sustainable-eating-chea...
Why the food system is the next frontier in climate action
Virtually all paths to a net-zero-emissions food system rely on consumers in high-income countries shifting to a more plant-forward diet, according to a recent study.
https://yaleclimateconnections.org/2023/04/why-the-food-syst...
How can the calories out be more than the calories in?
Or are you suggesting people don't get all the calories they eat from plans? I don't think this is true.
I raise chickens and feed them my kitchen and yard waste. They also eat bugs.
Two chicken eggs can power me all day.
Reason about that "trophic energy loss [gain]".