David Malouf’s poetry collection “Earth Hour” addresses memory, imagination, and mortality. The poetry seamlessly blends light and dark, humor and gravity, as they transition between boundless depths and odd passages with grace and wit. Malouf presents a picture of “this patch of earth and its green things,” illustrating how beauty perseveres in the face of human decency. The poems also explore the various ways memory traces space, enveloping the individual in an individualized world map.