Why have Olympic pools turned green?

Organisers said the discolouration was caused by drop in alkalinity in the pools

‘Super bacteria’ found at Brazil Olympic venues, beaches

They can cause infections, meningitis and lead to death

WHO to discuss Zika impact on Rio Olympics next week

Concern over the spread of the disease is growing with athletes pulling out of the event and scientists writing to WHO to move or postpone the Games

Updates From Rio

The Rio+20 challenge

Green economy in the context of sustainable development and poverty eradication are the two themes of the summit, but consensus eludes on both …

First global standard to measure greenhouse gas emissions from cities launched

The standard launched in Lima will help cities track their emissions and develop action plans to reduce it

Seven point agenda for Rio meet on sustainable development

Differences remain between developed and developing countries

The bumpy road to Rio+20

The meeting will review achievements and failures since the Earth Summit of 1992