This is the polar bear capital of the world, but the snow has gone

Canada’s Hudson Bay is as ice-free in November as on a summer’s day and polar bears could be extinct here by mid-century. If the bears are in trouble, so are we

Wine: how much is too much to spend on Christmas fizz?

Is it worth shelling out more than a tenner for a bottle of festive bubbles?

This $500 shirt changes color when exposed to air pollution – but who does it help?

A NYC-based designer says he wants to make people pay more attention to the environment. But at these prices, is this more art than activism?

A taste of caviar … the sturgeon will see you now

Aquitaine, in south-west France, is a caviar region to rival the Black Sea – and one local producer is offering enthusiasts a farm tour and tasting

Window shopping: Rightmove’s 10 most popular properties – 2016

From Harry Potter’s house to an island fort and a Shropshire cave

All about my mother: growing up with Franca Sozzani, editor of Vogue Italia

Franca Sozzani, editor of Vogue Italia, has single-mindedly dedicated herself to being fashion’s most creative editor. Now her son Francesco Carrozzini has made a film about her