Boston, Copenhagen, Kyoto: science is global and scientists are jetting around the world. Like the rest of society, science should lower its carbon emissions to net zero emissions in the next 30-50 years, in order to halt global warming below +2 degrees Celsius. Scientists and scientific institutions need to act now. Yet, how is it best to achieve decarbonisation? Is global science with only very few flights possible? Are there any tradeoffs for the scientific competitiveness? Join us to explore this issue.