Is the world running out of fresh water?

Increasing temperatures and populations threaten a precious element and pose a serious problem. What can we do about protecting our most vital resource? By Tim Smedley – The next time you open a can of soft drink, consider where the water inside it …

The air that makes you fat

Some puzzling studies appear to show that tiny airborne particles may contribute to obesity, diabetes and heart disease. Should we be concerned? By David Robson – Take a deep breath, and exhale. Depending on where you live, that life-giving lungful of air might …