This article provides an overview of the grand challenges in environmental psychology. Environmental psychology is the subdiscipline of psychological science that deals with psychological processes engaged in encounters between people and the built and natural environment. Global climate change is currently one of society's grand challenges. The current anthropogenic global warming is coupled with an exponential human population growth that is placing tremendous demands on agricultural and natural resources. Environmental psychology will have to confront a range of theoretical, methodological and conceptual challenges. These include applying knowledge from cognitive psychology-on memory, attention, perception and performance, -to classic questions in environmental psychology,such as how natural environments can facilitate restoration from attentional fatigue; how brain imaging method scan be employed to address how the human brain interacts with the built and natural environment; and how evolutionary perspectives can inform environmental design.