Four years ago, as COVID-19 gathered steam, I wrote an article titled “Reducing pandemic risk begins with ending factory farming.” But here we are again. Avian flu is raging throughout the country, having jumped the species barrier from birds to mammals, even killing cats and showing up in cows’ milk. Yet the potential for a new human pandemic, should the disease find its way from other mammals to us, is only casually tossed around. Such a jump from animals to people has happened more than once, with COVID and other diseases, including avian flu....