These are the countries most dependent on natural resources -agriculture, including forestry and fisheries- for their livelihoods. Shaded countries are Least Developed Countries. Ubiquitous Sensor Networks (USN). The IPCC 4th assessment report shows some of these impacts (Figure 3.2). It can be expected that natural ecosystems as well as agricultural systems will be less resilient because rising temperature will alter the fitness of species that together define given ecosystems.