An international group of experts has just completed a thorough assessment of recent research on climate change science. This sobering document, published by the Intergovernmental Panel on Climate Change (IPCC) in 2007, calls warming of the climate system "unequivocal" and attributes most of the observed recent global warming to human activities, with a confidence level of 90% or more. At the same time, new research shows that previous IPCC projections have not exaggerated the climate changes observed since 1990 and may even have underestimated some aspects of them. As human activities continue to modify the climate system, what will the implications be for rising sea level, hurricanes, and other phenomena? This talk summarises the key scientific findings and points out areas where scientific confidence is high as well as unsolved scientific issues which await further research progress.