Looking back through our back-catalogue of blogposts, I find that last winter I was provoked by David Attenborough’s closing words of BBC’s Planet Earth to consider what practical actions we could all take to, as the veteran broadcaster said, ‘create a planet that provides a home ... for all life on earth’. Similarly this winter, the provocative images of last year’s Blue Planet II still linger on the mind, of plastic in the oceans. Each year we produce over 300 million tonne