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Switching to a vegetarian diet can potentially reduce your food-based carbon footprint by...
a third or more. Going vegan and eliminating dairy- and other animal-based food products would cut it down even more. That's not to say everyone absolutely has to go 100% plant-based in order to save the planet. Even just reducing your consumption of meats (especially red meat) and dairy products with a higher carbon impact can help decrease emissions, both on an individual and collective level.
What can you do? If you're not quite ready to give up meat completely, you can start out by trying a flexitarian diet. This eating lifestyle puts a heavy emphasis on plant-based foods, while still allowing for the occasional consumption of beef, poultry, fish and pork. If you're not a big meat-eater anyway but still enjoy seafood, try going pescatarian, and be sure to choose sustainably sourced fish.