Europe's GEANT, the world's largest multi-gigabit computer network dedicated to research and education, is linking up to similar networks world-wide to create a single global research network. In Europe, GEANT already links researchers from Reykjavik to Vladivostok, serving around 30 million users in over 3500 universities and research centres and connecting 34 national research networks. High-speed links will now be established with regional research network infrastructures emerging in the Balkans, the Black Sea and Mediterranean regions, as well Asia, Southern Africa and Latin America. In Europe, GEANT has enabled ground-breaking research collaboration in fields such as climate change, radio astronomy and biotechnology.