I’ve never met a librarian who didn’t offer enthusiastic help when asked. I’m sure there are some cranky ones out there, but I can’t think of a public facing job where the workers are as cheerful and helpful as librarians. It takes a certain temperament to devote your life to encouraging others to read books.
Cats reduce pollutants that contribute to smog that directly harm human health. But they do nothing to reduce the net carbon released into the atmosphere. In fact, by converting carbon monoxide to carbon dioxide they are hastening climate change (CO2 is a more potent greenhouse gas than CO).