Andrew Collier 
Being and Worth [PDF ebook] 

Being and Worth extends recent depth-realist philosophy to the question of values. It argues that beings both in the natural and human worlds have worth in themselves, whether we recognise it or not. This view is defended through and account of the human mind as essentially concerned with that of which it is independent. Conclusions follow both for environmental ethics — that natural beings should be valued for themselves, not just for their use to us — and for justice in the human world, based on the idea that humans are unique and equal in respect of ‘having a life to live’.