Example of overlap between land challenges. (a) Overlap between the desertification (from land use) challenge and the climate change adaptation (strong dissimilarity in seasonal cycles) challenge. (b) Overlap between the land degradation (soil erosion proxy) challenge and the climate change adaptation challenge. (c) Overlap between the desertification or land degradation challenges and the food insecurity (chronic undernourishment) challenge. (d) Overlap between challenges shown in C and the climate change adaptation challenge. For challenges definitions, see text; references as in Figure 6.2.