Wasser

Biodiversity

Global warming and biodiversity loss mutually reinforcing

Universities

The merits of studying abroad

Drought

Zimbabwe’s disappearing cows

Informal settlements

Living on the edge

Sanitation

Clean water, clean contracts

Siltation

Stream-bank cultivation and gold panning add to the problems

Urban development

Why real-estate prices are rising fast in Istanbul

Urban development

Urban growth can cause water supply problems

Fish farms

Catch of the day