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pretty much any kind of farming disrupts the local ecosystem, especially as you start using modern techniques to maximize yield. You are displacing what grew there naturally to grow the particular crop you want. And you want it to be a monoculture, you don't want your corn field to be full of weeds consuming the limited nutrients and water at your disposal. The animals that fed on those native plants or lived among them will be affected, and may or may not adapt. Spraying pesticides or herbicides makes further changes, etc.
The biggest issue with eating meat is the amount of resources required to raise those animals. Lots of water and lots of food to get one pound of beef. So as more countries become more affluent and consume more meat, the amount of food and water grow at an increasing rate.
That said, I love steak.
The study is somewhat interesting. I'm not going to change my habits based on it, but it is food for thought.
For those that choose to eat eggs and cheese instead of meat, the chicken that laid those eggs only exists because a farmer bred and raised it for the sole purpose of making more eggs. When it can no longer make eggs, it is killed. So if you think you are saving lives, you aren't really. Of course, without eating eggs, that chicken wouldn't have ever existed in the first place.
Bottom line: eat what you want.
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