The extinction inside our guts - LA Times

"The world is facing an extinction event. Hundreds of species are disappearing from their native habitat. This impending extinction is distinct from the plight of the polar bears or frog populations and is not a result of global warming or deforestation. It's happening within our guts, which are home to the trillions of microorganisms called the microbiota and the 2 million genes they carry called the microbiome."