In the '50s I had a friend who ran a very large chicken "farm". He had a lot of control over what his chickens ate. It's also well-known that our meat supply can be easily contaminated by whatever our meat supply eats.
Do you deny any of that (try to understand my meaning before you reply)?
Looks like He didn't tell you everything. I guarantee, He sure didn't have very much control over what they did with what he provided, after they ate it.
Enjoy your next chicken. Now that you know what you are eating.
That is a choice you can make.
Otherwise, sit back, relax, there isn't anything you are Al Goracle can do about Global warming.