I came across this site while posting in Kijiji (eggs for sale), interesting site - explains things like organic, cage raised, pastured, etc.
https://foodprint.org/eating-sustai...MI2Z7W5OLXgwMVnWBHAR0LHwFREAAYASAAEgLw8vD_BwE
https://foodprint.org/eating-sustai...MI2Z7W5OLXgwMVnWBHAR0LHwFREAAYASAAEgLw8vD_BwE