A 3,600-square-foot rooftop garden caps this office space retrofit by Cook+Fox Architects

Global investment in renewable energy powered to record $257 billion in 2011, according to UN report

With bleak European prospects, clean energy companies focus on other markets

Big surprise: Portland is number one

Slowly but surely, the sustainability agenda is seeping into business education

The indelible link between climate change and social unrest in the Arab world

Grocer announces plan to stop selling 'red-rated' seafood

Innovation group challenges people to re-imagine the city of the future