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- Ethical reasons: hundreds of billions of animals are killed every year (not counting fish), after living a miserable and short life.
- Environmental: greenhouse emissions (CO2 and methane), deforestation for pastures, water pollution, are all caused by animal agriculture. If everyone went vegan we’d need only 25% of the land we currently use for agriculture.
- Health: there is some evidence that meat causes cancer, and convincing evidence that processed meat causes cancer. Also, the use of antibiotics for animals can lead to the development of antibiotic-resistant bacteria.
Cow farts are methane, which are a more aggressive form of greenhouse gas, though with shorter lifespan.
That’s just for colorectal cancer. It also affects other types of cancer (like breast cancer) and increases the chance of dying from heart disease considerably.