Fresh water conservation

Fresh water makes up less than 3% of Earth’s water, yet demand keeps rising. This archive tracks real progress in protecting rivers, aquifers, wetlands, and watersheds — from policy wins and technology advances to community-led restoration efforts that are actually working.

Irrigation canal at sunset, for article on early irrigation systems

Early civilizations independently develop irrigation, transforming how humans grow food

Irrigation emerged around 6,000 years ago in at least four corners of the world at once — Mesopotamia, Egypt, the Indus Valley, and China — with farmers in each place learning to channel rivers onto dry fields. Along the Tigris and Euphrates, the earliest known canals redirected water into otherwise barren land. It’s one of history’s clearest cases of parallel invention.