This compilation of Clarence Glacken’s ‘lost works’ is an invaluable gift. It is a brilliant treatment of some of the most important environmental thinkers of the last two centuries, and Glacken provides new and fresh insights even into thinkers such as Darwin, about whom so much has been written. This important work holds appeal not only for geographers, historians, and ecologists but also for anyone interested in the environment, science, and intellectual history.–Diana K. Davis, University of California, Davis, author of The Arid Lands: History, Power, Knowledge."As we now fear climate change (and its deniers) and aggrandise ourselves as living in the Anthropocene, Glacken’s quiet, sane voice asking us to intelligently investigate what nature is and how we’ve come to understand it is more needed than ever. We can only hope that the current tendency to political polarisation in attitudes to the environment does not leave Glacken as marginalised a voice as he was half a century ago." - Robert J. Mayhew, Times Higher Education