What if there is no such thing as a real passage of time? What differences would this idea make for our conception of the world and of our lives in the world? Donald A. Crosby's Primordial Time: Its Irreducible Reality, Human Significance, and Ecological Import defends the objective, underived reality of time and its crucial existential significance on the basis of the essential role of the qualitative, inner experiences of the passage of time and with a variety of other scientific and philosophical arguments concerning time. He also explores the urgent reality of time in relation to the ecological crisis of our day.