This book seeks to provide a bridge from the peer-reviewed scientific literature to a broader audience of society while providing the depth of science that the complex issue demands and deserves. The chapters cover what we have already observed in the global and Australian climate; how greenhouse gases affect climate; our modelling of the future; how we might adapt to and prepare for climate change and how we might mitigate to reduce greenhouse emissions. These aspects are all important as we seek a comprehensive response to climate change.