This introductory paper discusses tourism's role in relation to climate change mitigation and adaptation, at a time when climate change is at the forefront of many political discussions, including the 2009 Climate Summit in Copenhagen, and many business decisions. The development of tourism research in response to climate change in the past 25 years is outlined and limitations are identified. The paper also argues that while growing engagement with the challenge of climate change is evident across the tourism industry, this is still limited and not widespread. The minor role played by tourism interests in the international climate negotiations in Copenhagen is noted and discussed. Questions are raised around the willingness and ability of both the tourism industry and tourists to significantly reduce global emissions. The papers brought together in this Special Issue (Journal of Sustainable Tourism, 18.3) both highlight key challenges that tourism faces in its attempts to better understand and manage the problem of climate change, and suggest valuable ways forward.