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Complex global challenges transcend national boundaries and pose significant threats to societies, ecosystems and humanity. Addressing such challenges in a sustainable manner requires strategic research investments, international collaboration, collective resources and knowledge exchange between diverse communities. Global Challenges is a new open access journal that cuts across disciplines and international boundaries to bring science, technology, and social science communities together to ensure that research informs policy. The journal publishes research on climate change, energy, food, agriculture & nutrition, global heath, and water. For more information, and to learn how to submit your next research paper, visit: www.global-challenges.com.