The ideal number of humans on Earth is around 2.5 billion and a major study explains what that means for our future.

Knowledge on respiratory syncytial virus (RSV) risk factors may help inform public health authorities on high-risk populations, researchers suggest. “Although existing evidence from community-based ...

Right now, human population growth is doing something long thought impossible—it's wavering. It's now possible global population could peak much earlier than expected, topping 10 billion in the 2060s.

In recent years, the idea of having fewer children or not having children at all has been put forward by some climate activists as way to tackle climate change. A few scientific studies have ...