Scientists say 'prelude' to the sixth mass extinction is happening right now
When plant and animal species go extinct, it's usually a clear sign that humans have messed up. We've over-hunted, destroyed habitats, polluted waterways, and altered the climate by burning fossil fuels, wiping species off the planet for good. We tend to study extinctions to understand just how much we have disrupted the planet's ecosystems. But in a new scientific study published on Monday, scientists said we're not paying nearly enough attention to the "prelude" to global extinction...