If the world’s pet dogs were transitioned onto nutritious diets which excluded all animal products, it would save greenhouse gas emissions equivalent to 0.57 gigatonnes (1 gigatonne is 1 billion tonnes) of CO₂ a year – much more than the UK emitted in 2023 (0.38 gigatonnes) – and liberate an area of land larger than Mexico, potentially for habitat restoration which would boost carbon capture and biodiversity.
Pet cats eat one billion land-based food animals annually, and vast numbers of fish. Feeding them nutritious vegan diets instead would eliminate greenhouse gas emissions equivalent to 0.09 gigatonnes of CO₂ – more than New Zealand’s annual emissions (with its very large methane-emitting dairy industry) – and would save an area of land larger than Germany. Seventy million additional people could also be fed using the food energy savings – more than the entire UK population.
At least six billion land-based “food animals” would also be spared from slaughter annually
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https://theconversation.com/what-if-every-pet-was-vegan-heres-how-much-it-would-help-the-planet-242829
https://szmer.info/post/5569732