In an unprecedented field experiment, an international research team led by Goethe University Frankfurt, the University of California, Berkeley, and CNRS Montpellier investigated the evolutionary adaptation of thale cress (Arabidopsis thaliana) to a wide range of climates, from the Alps to the Negev Desert. At 30 locations worldwide, team members sowed the plants, monitored their development, and analyzed genetic changes. The result: many Arabidopsis populations rapidly adapted to local climates – some, however, went extinct. The findings demonstrate how genetic diversity ensures population survival.