Bruce Campbell is director of the Climate Change, Agriculture and Food Security programme (CCAFS), a strategic partnership of the Consultative Group on International Agricultural Research (CGIAR) and the Earth System Science Partnership (ESSP). CCAFS brings together the world's best researchers in agricultural science, development research, climate science and Earth System science to identify and address the most important interactions, synergies and tradeoffs between climate change, agriculture and food security. Follow him on Twitter: @bcampbell_CGIAR or @cgiarclimate .