Large parts of the consumed meat come from industrial mass animal farming. Besides ethical concerns, this is particularly problematic for the environment: there are high greenhouse gas emissions, high water and land usage, and biodiversity is threatened by monoculture feed production, which also involves very high pesticide use. Additionally, the systematic use of antibiotics among animals leads to antibiotic-resistant bacteria.
The Earth's resources are finite. It is foreseeable that this seemingly insatiable craving for meat and the finite availability of fertile land and water will cause conflicts.
They are already doing it - for example, when the feed for livestock in Europe comes from Latin America, where people are more frequently affected by poverty.
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