He has worked on nonverbal behavior and on climate change behavior barriers. Gifford is the author of five editions of Environmental Psychology: Principles and Practice, which has also been translated into Japanese, and edited Research Methods for Environmental Psychology (2016).
He has worked on behavioral aspects and on impediments to environmental change. Gifford is the author of five editions of Environmental Psychology: Principles and Practice, which has also been translated into Japanese, and edited Research Methods for Environmental Psychology (2016).