Can a transition to renewable energy take place fast enough to reduce the greenhouse gas emissions as much as 85 percent by 2050 so that the average global temperature does not increase by more than 2 degrees centigrade above the preindustrial level? Several studies show that a 50 percent reduction is possible with widely implemented energy efficiency measures and wide-scale introduction of renewable energy technologies. However, fossil fuels, in particular coal, will still be needed for decades to come. Therefore, carbon dioxide capture and storage will have to be used on a large scale to curb emissions further. In fact, the “IEA 2050 Energy Roadmap” (International Energy Agency) relies on some 20 gigatons of carbon dioxide to be stored underground, both on- and off-shore. Capture and storage is a formidable challenge. The European Union supports several research projects as well as technology demonstrations. The same applies for the U.S. Department of Energy, Natural Resources Canada, and many other funding agencies. The sharing of knowledge between projects and programs makes the progress faster and the developed solutions safer. The symposium presents worldwide best practice in carbon dioxide storage security and environmental safety, securing the public acceptance and trust.