The sun is midway through its life of fusion. It's about 5 billion years old, and though its life is far from over, it will undergo some pronounced changes as it ages. Over the next billion years, the ...

Biosphere Reserves are some of the most biologically diverse and important protected areas in the world—but what exactly makes them so unique? What kinds of reserves exist across the world—and how can ...

The hydrological cycle is a fundamental natural process for keeping Earth’s operating system intact. Humanity and civilization are intimately dependent on the water cycle, but we have manipulated it ...