According the United Nations, the livestock industry is one of the largest contributors to environmental degradation worldwide. It contributes to deforestation, air and water pollution, land degradation, loss of topsoil, climate change, the overuse of resources including oil and water, and loss of biodiversity. On top of the environmental impact, excessive meat consumption is bad for your health.
By cutting down on your meet consumption to just a few meals a week you are making a very real contribution to reducing negative environmental impacts and you may find yourself pleasantly surprised when you start experimenting with meat-free cooking. Whenever you do have meat, check to see that it has been sustainably and ethically produced.
Source: the Enviropaedia