Environmental philosophy reflects on the place of human beings in the natural environment and their various (ethical and other) relations to it. Its emergence as an academic subject over the last fifty years has paralleled growing recognition of environmental issues as vital for the contemporary world. We will explore some of its themes. We will also try to do some first-hand philosophical thinking about key concepts (sustainability, adaptation, resilience, disaster, transformation, hope…) now needed to grapple with the climate chaos and global mass extinction which humans are causing.