The Woodland Trust is devoted to saving the UK's forests and has been particularly active in the face of the UK Coalition Government's plans to sell off England's forests. (The Government has seen some sense at least thankfully and the plans have been abandoned, though the future of England's forests is probably still not certain.)
One of the things I particularly like about the Woodland Trust is the fact that they have a Creative Campaigning section to their website. This is full of poetry, art, films and other creative responses to woodlands and is well worth browsing. I was delighted to be contacted recently by the Woodland Trust and asked to contribute a page about haiku. You can read this page here.