If I were in a developing country, I would be worried that climate accords become a other way for those on top to stay there.
I suppose you were just providing a random example, but if you're curious the production of free-range eggs almost certainly pollutes more carbon than caged eggs [1] while being less ethically sound (assuming that was the consideration for cage-free), environmentally responsible, and typically more expensive than plant alternatives.
[1] https://www.smh.com.au/national/free-range-hens-boost-carbon...
Also, the report you cited was the (conventional) egg industry researching itself, not an independent study.
And this isn't in some hypothetical future. It's already happening.
Please add should, this should not be how human nature works.
Also, one capitalist cannot on the one hand free will is the key for prosperity, and at he same time ask others to think beyond others’ basic life needs while suffering.
Then when the extreme growth part passes it starts to stabilize: this is when the country & the people start doing well enough so that they can look at other issues (environmental impact) without having to sacrifice their livelihoods.
The human will always prioritize his own and his families livelihood. Only once that is stable can one afford to look at the impact.
If you're poor and can hardly afford basic stuff for your children you obviously won't care about the environment, it's last thing on your mind.
And if anyone writes "yeah but even poor people should care": no, that is not how human nature works. First you & your family, only then everything else.