The September 2013 IAEA Bulletin issue is published in conjunction with the 2013 IAEA Scientific Forum, entitled The Blue Planet ? Nuclear Applications for a Sustainable Marine Environment. The Scientific Forum focuses on the IAEA?s work with Member States and international partners in monitoring and evaluating the challenges facing our oceans, and in seeking solutions. Scientists at the IAEA Environment Laboratories in Monaco study biological processes to understand how marine organisms react to acidification and warming. They use isotopes to track the sources of pollution and its dispersion. The IAEA trains researchers from developing countries to use nuclear techniques to monitor pressures on the marine environment. It makes available precise and cost-effective tools to help both developed and developing countries to acquire the data needed to adapt strategies that mitigate pressures on the oceans.