There are 8 billion of us alive today, give or take a few hundred million. We crowd cities, cross oceans in mere hours, and argue through glowing screens. That certainly sounds like a lot of people, ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here’s what you’ll learn when you read this story: While most estimates place the current human ...

It’s a question most people instinctively push aside: Are there simply too many of us? For years, that idea felt exaggerated—something debated in academic circles but rarely taken seriously in ...