Yayoi Kusama named world’s most popular artist in 2014
The Japanese artist drew over 2 million viewers to her work – but a survey shows female artists are still less likely to be chosen for solo shows by American galleries
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Polar bears face starvation as unlikely to adapt to a land-based diet, says report
New research casts doubt on the theory that polar bears could survive habitat loss as sea ice declines by foraging for food on land
The 10 best model reinventions
With Cara Delevingne making her acting debut in Michael Winterbottom’s new film, we look at other models who have gone on to excel in other fields
Is being vegan the most ethical way to live?
Reducing meat consumption is important, but going vegan may not solve all our problems…
If you have an ethical dilemma, email Lucy at lucy.siegle@observer.co.uk
Subsidies to industries that cause deforestation worth 100 times more than aid to prevent it
Brazil and Indonesia paid over $40bn in subsidies to industries that drive rainforest destruction between 2009 and 2012 – compared to $346m in conservation aid they received to protect forests, according to new research
Net-a-Porter merger with Yoox: marriage of very different high-end fashion sellers
While one presents a chic edit of beautifully shot and styled designer pieces, the other – to the unitiated – appears to offer a more chaotic shopping experience