It may still be chilly outside, but our cosiest sweaters come with an environmental caveat. Conventional wool can have a carbon footprint that, according to some estimates, is up to 27 times that of cotton, while land degradation, deforestation and loss of biodiversity are all serious consequences of industrial sheep rearing. So how do we clean up our act while keeping warm?

It may still be chilly outside, but our cosiest sweaters come with an environmental caveat. Conventional wool can have a carbon footprint that, according to some estimates, is up to 27 times that of cotton, while land degradation, deforestation and loss of biodiversity are all serious consequences of industrial sheep rearing. So how do we clean up our act while keeping warm?