OMG… Greenland’s ice sheets are melting fast
Nasa’s Oceans Melting Greenland study will deploy 200 robot probes to measure the full extent of Arctic climate change
The Observer
Brewing up a storm: British-grown luxury tea brands go from strength to strength
Sales of standard teabags may be falling but our best growers are even exporting to China
Shanghai in slow lane as market crash accelerates slump in luxury car sales
Little interest in showrooms as deep discounts fail to drive in customers
The Stirling prize 2015: the virtues of quiet craft
The shortlist for this year’s Stirling prize is dominated by ‘whispering’ candidates – scrupulous designs of brick and timber
Yoko Ono: ‘To be an artist you need courage’
For more than 50 years Yoko Ono has been campaigning – for peace, for feminism, for gun control and, most recently, against fracking. This tireless activism, she says, is at the heart of her work as an artist. Alex Needham meets her at home in New York
Five of the best smartwatches for 2015
From the Apple Watch, the Pebble Time and a raft of Google Android Wear watches, there are a lot to choose from. Here are the five best.