After living in southern Angola for two years, Warren developed a coastal marine research program on this virtually unstudied egion. Since almost no information was available, this program began with a range of components from the most fundamental, such as taxonomy and phylogeography, through to the biology of important fishery species and socio-economic characteristics of the coastal fisheries. However, with significant warming observed in the coastal environment, this area provides a unique opportunity for climate change research and more recently, his research focus has shifted to the impacts of climate change on coastal fishes, including its affect on the distribution of fishes and the impact of change on fish reproduction.