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Domestic cats “amongst the most problematic invasive species in the world”
(www.theguardian.com)
Environmental and ecological discussion, particularly of things like weather and other natural phenomena (especially if they're not breaking news).
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My brother is the same way. My cat lives inside (though we have a large balcony he runs around on as well, with planters he can lay in and monch on the cat-safe stuff I grow in them), and he is much safer for it.
Outdoor cats die to vehicles constantly, so it's not just irresponsible towards local wildlife, it's also irresponsible towards the cats.